L’abandon d’une stratégie vieille de 250 ans… Ce que change la fin de l’obligation vaccinale dans l’armée américaine

Source: The Conversation – France in French (3) – By Katrine L. Wallace, Assistant Professor of Epidemiology and Biostatistics, University of Illinois Chicago

L’armée opère généralement dans des conditions – caserne, navire, etc. – qui favorisent la propagation des virus respiratoires Bumble Dee/Shutterstock

De George Washington à la Seconde Guerre mondiale, la vaccination a été pensée comme un outil stratégique face aux maladies capables de décimer les troupes. Aujourd’hui, cette logique historique entre en tension avec la montée des revendications individuelles.


Pour la première fois depuis près de 80 ans, les militaires états-uniens ne seront plus tenus de recevoir le vaccin annuel contre la grippe. Le secrétaire à la Défense Pete Hegseth a annoncé ce changement le 22 avril 2026. Invoquant l’autonomie médicale et la liberté religieuse, il a qualifié cette obligation de « trop large et dénuée de rationalité », déclarant aux soldats que « votre corps, votre foi et vos convictions ne sont pas négociables ».

L’obligation vaccinale contre la grippe à laquelle Pete Hegseth a mis fin était en vigueur depuis 1945, avec une brève interruption en 1949. Elle s’inscrivait dans une tradition d’obligations vaccinales militaires presque aussi ancienne que les États-Unis eux-mêmes.

En tant qu’épidémiologiste spécialisée dans les maladies évitables par la vaccination, je trouve la fin de cette obligation moins marquante pour ses effets immédiats que pour ce qu’elle révèle. Pendant la majeure partie de l’histoire américaine, les commandants militaires partaient du principe que les maladies infectieuses pouvaient leur faire perdre une guerre, raison pour laquelle la vaccination relevait de la préparation opérationnelle plutôt que d’un choix individuel.

Une tradition qui remonte à George Washington

La première obligation vaccinale militaire américaine est antérieure à la Constitution. À l’hiver 1777, le général George Washington ordonne l’inoculation massive de l’armée continentale contre la variole.

Sa décision n’était pas idéologique – elle était stratégique. L’année précédente, une épidémie de variole avait ravagé les troupes américaines près de Québec, contribuant à l’effondrement de la campagne du Nord. John Adams écrivit à sa femme Abigail que la variole tuait dix soldats pour un seul tombé au combat.

L’inoculation en 1777 comportait elle-même des risques. La procédure, appelée variolisation, consistait à infecter volontairement un soldat avec une faible dose du virus de la variole afin de provoquer une immunité. George Washington a fait le pari qu’il valait mieux perdre quelques hommes à cause de l’inoculation que perdre une guerre face au virus. Des historiens ont attribué à cette décision le salut de l’armée continentale.

La pandémie de Covid-19 a reconfiguré les enjeux politiques autour des obligations vaccinales.

Ce schéma s’est maintenu pendant des siècles : lorsqu’une maladie infectieuse risquait de mettre plus de soldats hors de combat que les tirs ennemis, l’armée imposait des mesures de protection.

Les troupes américaines ont été vaccinées contre la variole de la guerre de 1812 jusqu’à la Seconde Guerre mondiale. Pendant la Première Guerre mondiale, l’armée a ajouté la vaccination contre la typhoïde. Lors de la Seconde Guerre mondiale, elle a élargi les obligations vaccinales pour inclure également le tétanos, le choléra, la diphtérie, la peste, la fièvre jaune et, en 1945, la grippe.

1945 : nouvelle guerre, nouveau vaccin

L’obligation vaccinale contre la grippe trouve son origine dans les expériences militaires lors de la pandémie de grippe de 1918. Ce printemps-là, une nouvelle souche de grippe s’est propagée dans des camps d’entraînement militaires surpeuplés avant de gagner l’Europe avec les troupes américaines. Environ 45 000 soldats américains sont morts de la grippe pendant la Première Guerre mondiale, presque autant que les quelque 53 000 tués au combat.

La pandémie de 1918 a fait la démonstration qu’un virus respiratoire pouvait paralyser une armée. Aussi, en 1941, alors que le pays se préparait à entrer dans un nouveau conflit mondial, l’armée américaine a-t-elle mis en place une commission sur la grippe qui s’est associée à l’université du Michigan pour développer le premier vaccin contre cette infection. Des essais cliniques menés sur des recrues ont montré qu’il réduisait de 85 % l’incidence de la maladie, et en 1945, l’armée a rendu la vaccination obligatoire. Environ 7 millions de militaires ont été vaccinés cette année-là.

L’obligation a été brièvement suspendue en 1949, lorsque les scientifiques ont compris que le vaccin devait être régulièrement mis à jour en raison de l’évolution du virus. Une fois les formulations adaptées de manière saisonnière, l’obligation a été rétablie au début des années 1950 et est restée en vigueur sans interruption jusqu’au changement de politique décidé par Pete Hegseth.

Hôpital d’urgence au camp Funston, au Kansas, en 1918, pendant l’épidémie de grippe
La pandémie de grippe de 1918 a tué presque autant de soldats américains que les combats pendant la Première Guerre mondiale.
Otis Historical Archives, National Museum of Health and Medicine

Le Covid-19 a transformé la politique vaccinale

Pendant des décennies, les obligations vaccinales faisaient partie intégrante et peu contestée de la vie militaire. La pandémie de Covid-19 a changé la donne.

En août 2021, tous les militaires ont été sommés de se faire vacciner contre le Covid-19. Plus de 98 % des soldats en service actif ont obtempéré, mais cette obligation est devenue un point de crispation. Plus de 8 000 militaires ont été renvoyés de force pour avoir refusé le vaccin.

En 2023, le Congrès a adopté une loi obligeant Le Pentagone à annuler l’obligation vaccinale contre le Covid-19. Ce revirement a reconfiguré les enjeux politiques autour des obligations vaccinales dans l’armée. En janvier 2025, le président Donald Trump a ordonné la réintégration, avec indemnités rétroactives, des militaires renvoyés dans ce cadre.

En annonçant la fin de l’obligation vaccinale contre la grippe, Pete Hegseth s’est largement appuyé sur le vocabulaire de la « liberté médicale », issu des débats autour des vaccins contre le Covid-19, plutôt que sur de nouvelles données concernant la grippe ou l’efficacité du vaccin. Le mouvement pour la liberté médicale s’oppose à l’intervention de l’État dans ce que ses partisans considèrent comme des décisions de santé personnelles, y compris des recommandations de santé publique telles que les obligations vaccinales, le port du masque ou la distanciation sociale.

La justification vaccinale tient-elle toujours ?

Les critiques de l’obligation vaccinale contre la grippe dans l’armée avancent que la grippe constitue aujourd’hui une menace plus modérée qu’en 1918, que les militaires sont en meilleure santé que la population générale et que, pour un virus saisonnier, le choix individuel devrait primer sur la logique de santé publique.

L’épidémiologie raconte une autre histoire.

Même si l’intensité des saisons grippales varie, le virus mute de manière si imprévisible que des pandémies comme celles de 1918, 1957, 1968 et 2009 restent une possibilité récurrente. La grippe continue d’ailleurs de causer chaque année des hospitalisations et des décès par dizaines de milliers aux États-Unis. Les Centers for Disease Control and Prevention estiment que le vaccin contre la grippe a ainsi évité environ 180 000 hospitalisations et 12 000 décès lors de la saison 2024-2025.

L’armée opère précisément dans des conditions qui favorisent la propagation des virus respiratoires : centres d’entraînement, casernes, navires ou sous-marins où les individus vivent en promiscuité.

La logique qui a conduit George Washington en 1777 et le Surgeon General de l’armée en 1945 à imposer la vaccination n’a, au fond, guère changé. Un soldat malade ne peut ni être déployé, ni s’entraîner, et peut transmettre la maladie à toute une unité.

Ce qui a changé, en revanche, c’est le poids politique accordé au refus individuel et c’est cela, bien plus que la question de l’efficacité du vaccin, que reflète la fin de cette obligation

The Conversation

Katrine L. Wallace ne travaille pas, ne conseille pas, ne possède pas de parts, ne reçoit pas de fonds d’une organisation qui pourrait tirer profit de cet article, et n’a déclaré aucune autre affiliation que son organisme de recherche.

ref. L’abandon d’une stratégie vieille de 250 ans… Ce que change la fin de l’obligation vaccinale dans l’armée américaine – https://theconversation.com/labandon-dune-strategie-vieille-de-250-ans-ce-que-change-la-fin-de-lobligation-vaccinale-dans-larmee-americaine-281795

Les résidus de cocaïne dans les rivières et les océans modifient les déplacements des saumons

Source: The Conversation – in French – By Marcus Michelangeli, Lecturer, Environmental Sustainability and Management, Griffith University

Les poissons exposés à la benzoylecgonine parcouraient jusqu’à 1,9 fois plus de distance par semaine. Hans-Petter Fjeld / Wikimedia, CC BY

La présence croissante de drogues dans les milieux aquatiques n’est plus anecdotique. Une nouvelle étude menée en Suède montre que même à faibles doses, ces substances peuvent perturber les déplacements de poissons et potentiellement fragiliser des espèces déjà sous pression.


Du poisson ou des requins sous cocaïne : l’image semble tout droit sortie d’un scénario hollywoodien, mais la réalité est bien moins divertissante. De plus en plus souvent, les scientifiques détectent de la cocaïne et d’autres drogues puissantes dans les milieux aquatiques et les retrouvent jusque dans le cerveau et le corps des animaux sauvages.

Une étude de 2024 menée au Brésil a fait les gros titres après avoir mis en évidence la présence de cocaïne dans les muscles et le foie de requins sauvages capturés au large de Rio de Janeiro. Si cela peut surprendre, cette découverte reflète un phénomène plus large et en expansion : les drogues consommées par les humains se retrouvent désormais dans les rivières, les lacs et les océans du monde entier.

Dans notre nouvelle étude, publiée récemment dans Current Biology, nous avons cherché à comprendre ce que cela implique pour la faune sauvage.

Des poissons « sous cocaïne » dans la nature

Nous avons étudié comment des concentrations de cocaïne comparables à celles observées dans l’environnement influencent le comportement des poissons à l’état sauvage. Nous nous sommes également intéressés à une substance appelée benzoylecgonine, principal composé résiduel issu de la dégradation de la cocaïne par l’organisme.

Pour cela, nous avons mené une expérience dans le lac Vättern, en Suède, le deuxième plus grand lac du pays, où nous avons suivi de jeunes saumons atlantiques pendant huit semaines.

À l’aide d’implants chimiques à libération lente, nous avons exposé les poissons soit à la cocaïne, soit à la benzoylecgonine, puis suivi leurs déplacements grâce à la télémétrie acoustique. Cette méthode nous a permis d’observer leur comportement en milieu naturel, plutôt que dans des bassins de laboratoire.

Ce que nous avons observé est frappant. Les poissons exposés à la benzoylecgonine parcouraient jusqu’à 1,9 fois plus de distance par semaine que les poissons non exposés et se dispersaient jusqu’à 12,3 kilomètres plus loin à travers le lac. Les poissons exposés à la cocaïne présentaient une tendance similaire, mais l’effet était plus faible et moins constant.

Des eaux usées aux milieux aquatiques

Comment ces substances se retrouvent-elles dans les environnements aquatiques ?

Après consommation, la cocaïne est rapidement dégradée par l’organisme, principalement en benzoylecgonine. Des composés de ce type – résidus issus de la transformation d’une substance par le corps – sont appelés des métabolites. La drogue initiale comme son métabolite sont ensuite excrétés et rejoignent les systèmes d’eaux usées.

Or, les stations d’épuration ne sont pas conçues pour éliminer complètement ces composés : ils traversent donc les traitements et sont rejetés dans les rivières, les lacs et les eaux côtières.

Ce phénomène n’a rien de localisé. La cocaïne est désormais l’une des drogues illicites les plus fréquemment détectées dans les milieux aquatiques à l’échelle mondiale.

Une analyse globale a mis en évidence des concentrations moyennes dans les eaux de surface d’environ 105 nanogrammes par litre pour la cocaïne et 257 nanogrammes par litre pour la benzoylecgonine, avec des pics atteignant plusieurs milliers de nanogrammes. Si ces niveaux restent faibles, ils suscitent néanmoins des inquiétudes, car ces composés ciblent des systèmes cérébraux partagés par de nombreux animaux : même à faibles doses, ils peuvent donc potentiellement affecter la faune sauvage.

Pourquoi le comportement est crucial

Les changements de comportement comptent parmi les indicateurs les plus précoces et les plus sensibles d’une perturbation environnementale affectant la faune. Ils peuvent influencer des fonctions essentielles, depuis la recherche de nourriture et l’évitement des prédateurs jusqu’aux interactions sociales, à la reproduction et à la survie.

Lorsque des contaminants modifient les comportements, leurs effets peuvent se répercuter bien au-delà de l’individu. De légers changements dans la manière dont les animaux se déplacent, s’alimentent ou réagissent aux menaces peuvent, à plus grande échelle, affecter la dynamique des populations, les interactions entre espèces et le fonctionnement des écosystèmes dans leur ensemble.

Les changements que nous avons observés dans la manière dont les poissons se déplacent dans leur environnement après une exposition à la cocaïne pourraient entraîner une dépense énergétique accrue, une fréquentation d’habitats de moindre qualité ou encore une exposition plus importante au risque de prédation.

Pour des espèces comme le saumon atlantique, déjà soumises aux pressions du changement climatique, de la perte d’habitat et d’autres polluants, même de légères perturbations comportementales peuvent venir aggraver les difficultés auxquelles elles sont confrontées.

Pourquoi le métabolite compte

L’un des résultats les plus surprenants de notre étude est que la benzoylecgonine a eu un effet plus marqué sur le comportement des poissons que la cocaïne elle-même. C’est un point crucial, car les évaluations des risques environnementaux se concentrent généralement sur les substances consommées par les humains, comme la cocaïne, plutôt que sur celles qu’ils rejettent ensuite, comme la benzoylecgonine.

Or ces métabolites sont souvent plus abondants et plus persistants dans les milieux aquatiques. Nos résultats suggèrent que nous sous-estimons peut-être les risques écologiques liés à ces polluants.

Notre étude s’est concentrée sur le comportement, et non sur les effets à long terme sur la santé. Nous n’avons pas encore évalué si ces changements influencent la survie ou la reproduction.

Cependant, des travaux antérieurs montrent que la cocaïne et des composés apparentés peuvent modifier la chimie du cerveau, accroître le stress oxydant et perturber le métabolisme énergétique chez les animaux aquatiques. Ces processus étant étroitement liés à la santé et à la condition physique, ils laissent entrevoir des effets plus larges.

L’idée de « poissons sous cocaïne » peut faire sourire, mais elle renvoie à un problème bien plus vaste. Les milieux aquatiques sont de plus en plus contaminés par des mélanges complexes de substances d’origine humaine, des médicaments aux drogues illicites. Beaucoup de ces composés sont biologiquement actifs à de très faibles concentrations, et nous commençons à peine à en comprendre les effets.

The Conversation

Marcus Michelangeli travaille pour Griffith University. Il a reçu un financement et un soutien à la recherche du Conseil suédois de la recherche Formas (2022-00503), ainsi que du programme de recherche et d’innovation Horizon 2020 de l’Union européenne dans le cadre d’une bourse Marie Skłodowska-Curie (101061889) pour mener ces travaux.

Jack Brand travaille pour l’Université suédoise des sciences agricoles et reçoit un financement du Conseil suédois de la recherche Formas (2024-00507). Il occupe également un poste de chercheur invité à l’Institute of Zoology de la Zoological Society of London.

ref. Les résidus de cocaïne dans les rivières et les océans modifient les déplacements des saumons – https://theconversation.com/les-residus-de-coca-ne-dans-les-rivieres-et-les-oceans-modifient-les-deplacements-des-saumons-281545

Why postal codes shouldn’t determine RSV protection in Canada

Source: The Conversation – Canada – By Sophie Webb, Postdoctoral Fellow,  Bridge Research Consortium, Simon Fraser University

Respiratory syncytial virus (RSV) is a familiar seasonal illness, but the tools to prevent it are new. Canada has recently approved vaccines for older adults and pregnant people, along with a long-acting monoclonal antibody that can protect infants through their first RSV season.

These innovations offer new ways to reduce hospitalizations and severe illness. Yet whether Canadians can access them still depends largely on where they live.

Across the country, provincial RSV programs vary widely in eligibility, scope and public funding — see, for example, Ontario RSV program updates and Alberta immunization program information.




Read more:
RSV FAQ: What is RSV? Who is at risk? When should I seek emergency care for my child?


An infant eligible for publicly funded protection in one province may not be eligible in another. Seniors with similar health risks may face different access depending on their province. These differences are often dismissed as routine features of federalism.

But with World Immunization Week upon us, RSV provides the opportunity to ask a broader question: who’s responsible for delivering equitable access to vaccines in Canada?


Immunity and Society is a new series from The Conversation Canada that presents new vaccine discoveries and immune-based innovations that are changing how we understand and protect human health. Through a partnership with the Bridge Research Consortium, these articles — written by experts in Canada at the forefront of immunology, biomanufacturing, social science and humanities — explore the latest developments and their impacts.


New tools, uneven access

RSV prevention now includes vaccines for older adults and pregnant people, and a monoclonal antibody (nirsevimab) that offers season-long protection for infants with a single dose.

National guidance exists. The National Advisory Committee on Immunization recommends universal infant RSV immunization, but allows provinces to phase this in based on supply and cost. But these recommendations are advisory. Provinces ultimately decide what is publicly funded and for whom.

The result is a patchwork. Some provinces have expanded infant coverage, while others have limited access to those considered high risk. Adult and maternal programs also vary in eligibility, delivery and funding.

Cost plays a key role in these decisions. RSV therapies are expensive, and provinces must weigh them against competing health priorities. Epidemiological differences also matter, as do variations in disease burden and the additional challenges of vaccination in northern and remote communities.

Not all variation is inherently problematic. But together, these factors mean that access to protection is shaped as much by provincial priorities as by medical need.

When equity’s a goal but not a guarantee

In immunization policy, equity generally means ensuring that those at higher risk, or facing barriers to access, are protected first, and financial or geographic differences don’t determine who receives care.

RSV programs often emphasize protecting those at highest clinical risk, such as very young infants and people with underlying conditions. This approach is understandable. But it also narrows how equity operates in practice.

In a system where provinces determine their own budgets and priorities, equity can become something negotiated rather than guaranteed. One province may fund broader access; another may limit eligibility based on cost-effectiveness or capacity. The same intervention is therefore available to some populations and not others.

This shifts responsibility downward. Families must determine eligibility, navigate different rules, and sometimes absorb costs or logistical barriers to access. Equity becomes something people experience unevenly, rather than a guarantee built into the system.

COVID-19 offers a cautionary example. Communities identified as highest risk were often vaccinated later than wealthier neighbourhoods during early rollout phases. This prompted provinces to introduce reactive “hotspot” strategies that in some cases replicated the same effect. Simply naming groups as “equity-deserving” did not ensure timely access.

People in masks are vaccinated by health-care workers in protective gear inside a tent
A pop-up vaccine clinic in a Toronto hotspot neighbourhood in April 2021.
THE CANADIAN PRESS/Cole Burston

Governance and accountability

Canada’s immunization system involves multiple entities. Federal bodies approve products and issue recommendations. Provinces decide what to fund. Public health systems implement programs within local constraints.

While each level plays an essential role, none is clearly responsible for national equity, creating a governance gap.

Equity is widely endorsed, but no single body is accountable for delivering it nationally. RSV demonstrates how this plays out in practice — variation in immunization is accepted as a feature of federalism, rather than treated as a policy problem to be addressed.

Procurement adds another layer. Vaccine pricing and contract terms are not routinely disclosed in Canada, and negotiations with manufacturers are often confidential.

During COVID-19, federal vaccine contracts were released only after parliamentary pressure, with key details heavily redacted. Limited transparency makes it difficult to assess whether differences in access reflect pricing, negotiation leverage or policy choices.




Read more:
Consulting firms are the ‘shadow public service’ managing the response to COVID-19


Why it matters

RSV is one of the first major post-pandemic tests of Canada’s immunization system. It’s unlikely to be the last. New vaccines and antibody-based therapies are increasingly tailored to specific populations, making decisions about access more complex.

As these technologies evolve, governance matters more, not less. Without clearer accountability, innovations risk reinforcing variation rather than reducing it.




Read more:
Flu, RSV and COVID-19: Advice from family doctors on how to get through this winter’s ‘tripledemic’


RSV highlights a broader challenge in Canadian immunization policy — equity is widely invoked, but responsibility for delivering it remains diffuse. Without clearer co-ordination, transparency and shared expectations, access to protection will continue to depend on where people live.

For families of infants and seniors, that distinction is not abstract. It determines whether immunity is treated as a public good, or as a matter of postal code.

The Conversation

Cora Constantinescu receives funding from bioMerieux, GSK, merck, Pfizer, Sanofi, with funds being transferred to her University organisation

Sophie Webb does not work for, consult, own shares in or receive funding from any company or organisation that would benefit from this article, and has disclosed no relevant affiliations beyond their academic appointment.

ref. Why postal codes shouldn’t determine RSV protection in Canada – https://theconversation.com/why-postal-codes-shouldnt-determine-rsv-protection-in-canada-278717

Why the 60-day War Powers Resolution deadline doesn’t actually constrain presidents

Source: The Conversation – USA – By Jasmine Farrier, Professor of Political Science, University of Louisville

A TV displays U.S. President Donald Trump’s prime-time address on the war in Iran inside a Cheesecake Factory on April 1, 2026, in Washington, D.C. Anna Moneymaker/Getty Images

May 1, 2026, marks the 60th day of Operation Epic Fury in Iran – a symbolically significant date designating when a president who has mounted unilateral military operations must receive Congressional approval or wind it down.

However, the complex history of the War Powers Resolution clock demonstrates it is a toothless milestone.

The Trump administration signaled on April 30, 2026, that it would ignore that deadline, set by the War Powers Resolution. Secretary of Defense Pete Hegseth testified before the Senate Armed Services Committee that “we are in a cease-fire right now, which my understanding is that the 60-day clock pauses or stops in a cease-fire. That’s our understanding, so you know.”

Sen. Tim Kaine of Virginia, a Democrat, responded that the 60-day threshold poses a “legal question” and “constitutional concerns.”

This is not the first time presidents and members of Congress have sparred on the meaning of the War Powers Resolution. What happens next will play out through regular politics, because the conflict is not a matter of simple legal interpretation.

War: Collective judgment

In the U.S. Constitution, Congress and the president share war powers.

In the shadow of political struggles in the final years of the Vietnam War, Congress passed the War Powers Resolution in 1973 to “insure that the collective judgment of both the Congress and the President will apply to the introduction of United States Armed Forces into hostilities.”

A crucial section of the resolution reasserts legislators’ role, and makes clear that the constitutional power of the president to make war is subject to, or exercised with, the following conditions: a Congressional declaration of war; specific statutory authorization; or a national emergency created by attack upon the United States, its territories or possessions or its armed forces.

For new military campaigns that do not meet these criteria, the resolution included a 60-day clock that begins when a president reports the action to congressional leadership within 48 hours of the action beginning.

The clock can be expanded to up to 90 days upon presidential determination and certification of “unavoidable military necessity respecting the safety of United States Armed Forces” related to removal of troops.

After 60 to 90 days, the resolution originally said this type of unilateral military action would be terminated automatically unless both chambers of Congress approved some form of legislative authorization.

Congress could also choose to terminate an unauthorized military operation any time before the 60 days with a concurrent resolution, which doesn’t require a president’s signature – essentially, a “legislative veto.”

And to make sure the president couldn’t stretch the definition of congressional approval, the resolution said neither existing treaties nor new budget appropriations could substitute for legislative authorization of a military action.

Since 1973, actions by all three branches across a variety of political and policy landscapes have undermined its intents and procedures.

Veto vetoed

In 1983, the Supreme Court declared various kinds of legislative vetoes unconstitutional, which led Congress to reinterpret its War Powers Resolution procedures and powers and effectively amend its processes to expedite any joint resolution or bill that “requires the removal of U.S. armed forces from hostilities outside the United States.”

Now, if members want to stop a presidential military campaign already in progress, they must act affirmatively and pass a disapproval resolution, which a president could veto like any other bill. Congress has sent only one such disapproval – to President Donald Trump in his first term – which he vetoed. Congress did not have the two-thirds required in the Constitution to override.

Both chambers of Congress now have to vote twice, once to disapprove a military action and then again to overcome a likely veto, to stop something it never approved in the first place.

House Majority Leader Mike Johnson explains on March 4, 2026, why his party rejects a Democratic-led measure to assert Congress’ war powers and stop the Iran military action.

The 60-day mark for the current Iran operation has therefore loomed as more of a politically charged symbol of this longstanding imbalance on war powers than a real deadline for action by either branch.

Parallels to Kosovo and Libya

The House and Senate have tried to pass legislation to stop military operations against Iran six times since operations began. All attempts have failed, including the most recent vote on April 30. Democrats are considering filing suit against President Trump if operations go beyond 60 days without authorization.

Yet federal courts have long expressed disinterest in getting involved in constitutional questions related to the War Powers Resolution, especially if members of Congress are the plaintiffs.

Although most presidents from Richard Nixon onward have claimed that the War Powers Resolution is an unconstitutional check on their institutional powers, they usually filed the required reports on new military actions 48 hours after they began.

While the current Iran conflict is different in many ways, presidential unilateralism, inconclusive chamber actions and even member lawsuits all echo controversies over U.S. military action in Kosovo in 1999 and Libya in 2011.

Where Trump administration may lean on Clinton

Operation Epic Fury against Iran began Feb. 28, 2026, and President Trump sent the required report to Congress on March 2, 2026.

After detailing the rationale for military action, Trump added “Although the United States desires a quick and enduring peace, it is not possible at this time to know the full scope and duration of military operations that may be necessary.”

He concluded the memo with his interpretation of constitutional power to act unilaterally.

“I directed this military action consistent with my
responsibility to protect Americans and United States interests both at home and abroad and in furtherance of United States national security and foreign policy interests,” the president wrote. He acted, he said, “pursuant to my constitutional authority as Commander in Chief and Chief Executive to conduct United States foreign relations.” He said he made the report “consistent with the War Powers Resolution. I appreciate the support of the Congress in these actions.”

Similarly, on March 26, 1999, President Bill Clinton sent a War Powers Resolution letter explaining his decision two days earlier to take part in a NATO-led operation against the Federal Republic of Yugoslavia, known as FRY.

Clinton wrote to Congress using mostly the same words and phrases Trump did in his 2026 letter. Clinton also said that he took the action “in response to the FRY government’s continued campaign of violence and repression against the ethnic Albanian population of Kosovo.”

A gray-haired man in a dark jacket and blue tie, sitting at a desk in a very formal looking room.
President Bill Clinton after his television address to the nation on the NATO bombing of Serbian forces in Kosovo, March 24, 1999.
Pool/Getty Images

Clinton explained his authority in virtually the same language as Trump and, like Trump, said it was hard to predict how long the operations would continue.

The House and Senate repeatedly failed to either approve or disapprove of Clinton’s actions through a series of votes across March and April 1999. But lawmakers did send him supplemental appropriations for the operations in May.

NATO suspended the operation after 78 days. Almost a year later, a federal appellate court upheld a district court’s decision rejecting a lawsuit led by Rep. Tom Campbell, a California Republican, alleging Clinton violated the War Powers Resolution. Rather than deciding on the merits, the decision rejected the lawmakers’ claims of injury as not reviewable by the court.

Obama did it, too

In a very different context, a similar rhythm played out during President Barack Obama’s presidency.

During the “Arab Spring” revolts of 2010-2011, the U.N. Security Council passed two resolutions condemning violence against Libyan civilians by security forces under the direction of Colonel Moammar Gadhafi.

On March 21, 2011, two days after NATO operations began against Gadhafi’s forces, which included American air support, Obama sent his War Powers Resolution letter to the Republican House and Democratic Senate. Obama had not received prior legislative authority from Congress.

Obama’s letter included language almost identical to Clinton’s earlier letter and Trump’s later one.

As with Kosovo, the House and Senate did not ultimately agree to either approve or disapprove of the president’s actions in support of the UN and NATO over the operation’s 222 days. In addition, Democratic Rep. Dennis Kucinich of Ohio led a group of mostly Republican House members in a failed War Powers Resolution lawsuit to stop the president.

Unilateral action endures

The Office of Legal Counsel in the Department of Justice has published legal opinions that explain and defend presidential war powers, including with Kosovo and Libya. In December 2025, that office published a memo defending the imminent January 2026 capture of Nicolás Maduro. On April 21, 2026, the State Department published a defense of ongoing U.S. actions in Iran.

Within the current dynamics of the War Powers Resolution, until Congress musters bipartisan supermajorities to connect its own institutional ambition with constitutional power, presidents from either party will decide alone if, and when, the country goes to war. Instead of Congress, presidents may heed public opinion and economic indicators, especially in election years.

The Conversation

Jasmine Farrier is affiliated with the American Political Science Association.

ref. Why the 60-day War Powers Resolution deadline doesn’t actually constrain presidents – https://theconversation.com/why-the-60-day-war-powers-resolution-deadline-doesnt-actually-constrain-presidents-281724

Fiber’s structural integrity keeps plants strong – and its indigestibility keeps your digestive system healthy

Source: The Conversation – USA – By Julie Pollock, Associate Professor of Chemistry, University of Richmond

Vegetables, fruits, beans, seeds and nuts are all fiber-rich foods. tbralnina/iStock via Getty Images Plus

If you’re over the age of 10, the World Health Organization recommends that you consume at least 25 grams of fiber every day. The best fiber-containing foods come from plants: fruits, vegetables, nuts, seeds, whole grains and legumes.

While it’s sometimes overshadowed by other nutrients, such as protein, fiber plays a significant role in gastrointestinal health, digestion and nutrient absorption.

As a biochemist and someone who enjoys eating all types of foods, I find it remarkable that the structure of fiber, which is so similar to other carbohydrates, gives it all these unique functions. A tiny difference in the bonds that hold the molecules together allows your body to process a bagel differently from a raspberry.

Structure dictates function

In the biochemistry classes I teach, I emphasize that structure dictates function. If you’re about to cross a bridge but notice the braces are falling off or the wood is rotting, you’ll probably avoid stepping on it because the structure looks fragile.

This concept is true in the food you eat as well. The structures of the molecules that make up your food require them to be broken down in different ways in order to produce the energy that fuels your body.

Some foods contain vitamins and minerals that your body absorbs and uses for multiple functions. Other foods can keep your digestive system healthy and help your body absorb nutrients.

Food molecules consist of proteins, fats and carbohydrates. Each of these classes of food molecules has unique structures that allow your body to process them differently. For example, fats are long chains of carbon atoms that do not dissolve in water, while proteins have large amounts of nitrogen due to their amino acids. In addition, subclasses of biomolecules have even more specializations in their structures and functions.

Carbohydrate structure

Carbohydrates, or sugars, are biomolecules made up of carbon, oxygen and hydrogen atoms. Simple carbohydrates include single sugars, such as glucose or fructose, and two sugars linked together, such as sucrose – table sugar – or lactose, milk sugar. These simple carbohydrates exist mostly in rings, although they sometimes open up into a linear form.

Illustration of simple sugars – glucose, on the left, is one sugar made up of carbon, hydrogen and oxygen. sucrose, on the right, looks like two glucose molecules linked together
Simple sugars can be one sugar, such as glucose, left, or two linked sugars, such as sucrose, right.
Julie Pollock

Complex carbohydrates, on the other hand, have a lot – hundreds to thousands – of sugar molecules linked in large sheets called polysaccharides. These carbohydrates are linked only in their ring forms.

Plants connect sugar molecules in two types of polysaccharides – starch and fiber. These molecules have similar structures because they contain only one type of sugar – typically glucose – linked together many times.

However, one tiny difference in the chemical bonds within starch and fiber translates to very different functions for the molecules.

Starch, also called amylose and amylopectin, is a polysaccharide with glucose molecules that are linked using alpha bonds. Fiber, which consists primarily of cellulose, is a polysaccharide with glucose molecules that are linked using a beta bond.

The types of bonds refer to how certain parts of the molecules are oriented. These slight differences mean the two polysaccharides’ overall three-dimensional structures differ at the locations of these bonds.

The starch molecule is branched and doesn’t pack together very tightly. Plants use starch as a long-term store of glucose that they can break down to use for energy. The fiber molecules, due to their beta bonds, pack together very tightly. The glucose molecules in fiber form the support structures of a plant’s leaves, seeds and stems. The bonds of the starch enable the plants to easily break down the sugar so they can access quick energy, while the bonds of the fiber are designed to last and add strength to the plant’s architecture.

Drawings of complex carbohydrates. Starch on the left has a bond that is bent in a v shape, while fiber on the right has a bond that is straight.
The molecular structure of starch, left, and fiber, right.
Julie Pollock

Fiber’s dietary function

The structural differences between starch and fiber mean these molecules have different dietary functions when you consume them.

Human bodies easily digest starch. Your body uses an enzyme called amylase that breaks the alpha bonds to release glucose molecules, which cells break down further to use for energy. Starch’s structure is perfect for fueling your cells. High starch foods include potatoes, pasta, rice, corn and bread.

Human bodies, on the other hand, cannot digest the beta bonds in the fiber we consume. They do not make enzymes that can release glucose molecules from the fiber, so most fibers pass through your digestive tract without being digested and absorbed. They contribute no energy to your diet. Foods with large amounts of fiber include peas, broccoli, oatmeal and pears.

The fiber does offer other health benefits. Fiber promotes bowel health by keeping your stools soft and moist, which reduces the risk of constipation, hemorrhoids and diverticulosis. Since the fiber stays intact in your gut, it gives your muscles something to push on to make it easier to eliminate stools, reducing pressure and inflammation in your intestines.

Some research has shown that consuming fiber reduces risk of inflammatory bowel diseases and protects against cardiovascular diseases. Fiber binds to bile acids that are excreted into your intestines, which helps with fat digestion. The fiber molecules interact with bile acids and dietary cholesterol, causing them to be excreted more easily and lower blood cholesterol levels.

Eating a high fiber diet also helps people feel more full. The fiber absorbs water and expands in your intestine, slowing the movement of food through the digestive system.

Learning about the structures of the carbohydrates you consume can help you understand their function in the body. Even though I think about biochemistry every day, I’m still amazed by how profoundly one bond can change the function of a biomolecule.

The Conversation

Julie Pollock receives funding from the Henry and Camille Dreyfus Foundation

ref. Fiber’s structural integrity keeps plants strong – and its indigestibility keeps your digestive system healthy – https://theconversation.com/fibers-structural-integrity-keeps-plants-strong-and-its-indigestibility-keeps-your-digestive-system-healthy-280248

Moins d’enfants, mêmes désirs : que révèle la baisse de la fécondité ?

Source: The Conversation – in French – By Laurence Charton, Sociodémographe, Institut national de la recherche scientifique (INRS)

Avec un indice synthétique de fécondité (ISF) de 1,33 enfant par femme en 2024, le Québec atteint son niveau le plus bas de son histoire démographique.


Ce chiffre, bien inférieur au seuil de remplacement des générations (2,1), alimente des débats récurrents sur le « déclin de la fécondité » ou l’« hiver démographique ». Ces formules masquent toutefois la complexité des dynamiques démographiques en jeu et les réponses politiques qu’il conviendrait d’adopter.

Sociologue et démographe, professeure titulaire à l’Institut national de la recherche scientifique (INRS), je m’intéresse aux conditions sociales qui conditionnent les choix et comportements reproductifs, notamment le fait d’avoir – ou de ne pas avoir – des enfants. C’est dans cette perspective que j’interroge ici ce que la baisse de la fécondité au Québec révèle, et ce qu’elle nous invite à repenser collectivement.

Trois phénomènes distincts derrière l’idée de « déclin »

L’expression « déclin de la fécondité » renvoie en réalité à trois phénomènes démographiques différents.

D’abord, le report des naissances. Au Québec, l’âge moyen à la première maternité dépasse aujourd’hui 30 ans, contre 25 ans en 1975, ce qui fait mécaniquement baisser les taux annuels de fécondité aux âges de la vingtaine, mais sans refléter nécessairement le nombre final d’enfants par femme.

Ensuite, la part des femmes sans enfant. Ce phénomène demeure cependant relativement stable, notamment au Québec depuis la génération 1965, contredisant ainsi dans la foulée l’idée d’un rejet de la maternité ou d’une montée du « non-désir d’enfant ».

Enfin, le nombre moyen d’enfant par femme en fin de vie reproductive. Avec un nombre d’enfants plus faible pour les générations actuelles comparativement aux précédentes, c’est ce phénomène qui contribue le plus aujourd’hui – au Québec et ailleurs – à la baisse de la fécondité.

Un écart persistant entre désirs et réalisations

Les études montrent que dans tous les pays occidentaux, les femmes et les hommes souhaitent encore en moyenne deux enfants. Pourtant, la plupart des personnes ne concrétisent pas leurs projets parentaux. Cet écart persistant suggère ainsi que la dénatalité ne vient pas des personnes elles-mêmes, mais de leurs conditions de vie.

Les aspirations reproductives n’ont pas diminué au cours des dernières décennies, mais les conditions structurelles se sont dégradées : logement cher et rare, insécurité locative, marché du travail précaire, horaires flexibles et atypiques, et inégalités persistantes dans le partage des responsabilités parentales, influencent surtout négativement la décision des couples d’avoir un deuxième ou un troisième enfant. Plus particulièrement, ces conditions structurelles sont plus susceptibles de décourager les femmes, qui assument davantage que les hommes les charges domestiques et familiales




À lire aussi :
Le travail invisible, une lutte sans fin pour les femmes


Au Québec, les régions où la fécondité est plus élevée sont d’ailleurs celles où l’accès au logement est encore globalement plus facile, comme en Chaudière-Appalaches, au Saguenay–Lac-Saint-Jean ou en Abitibi-Témiscamingue. Ces régions sont également celles qui permettent aux couples de compter le plus souvent sur le soutien de leur réseau familial.


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Ce que montrent les comparaisons internationales

En 2023, la France enregistre un ISF à 1,59 (le plus élevé d’Europe), tandis que les pays nordiques oscillent entre 1,43 et 1,49, et que le Québec se rapproche de l’Allemagne (1,38) et du Canada dans son ensemble.

Ces différences ne reflètent pas des écarts dans les intentions de fécondité, mais plutôt des choix politiques. Les études comparatives montrent, par exemple, que les primes et allocations à l’enfant n’ont pas d’effet durable sur la fécondité. Les politiques efficaces sont celles qui combinent services de garde accessibles, congés parentaux bien rémunérés et partagés, logement abordable et flexibilité réelle du travail.




À lire aussi :
Le travail invisible, une lutte sans fin pour les femmes


Le Québec en a d’ailleurs déjà fait la démonstration avec une remontée notable de la fécondité au tournant des années 2000 lors de la mise en place des centres de la petite enfance (CPE) et du régime québécois d’assurance parentale (RQAP). Avant que cette dynamique ne s’essouffle, ces politiques avaient su réduire concrètement les obstacles à la parentalité en allégeant le poids financier et organisationnel qui pèse sur les familles. Cependant, la saturation progressive des services de garde, la flambée des coûts du logement et l’incapacité des pouvoirs publics à adapter leurs interventions aux nouvelles réalités des ménages (familles monoparentales, horaires atypiques, précarité d’emploi) ont fini par éroder les gains obtenus, faute d’une vision politique capable d’accompagner l’évolution profonde des structures familiales et sociales.

Une question de conditions, non d’incitatifs

Le niveau de fécondité reflète la cohérence entre politiques publiques et aspirations familiales.

Lorsque les intentions restent stables, mais que les réalisations diminuent, c’est le signe que les conditions matérielles et organisationnelles ne suivent plus. Miser sur des incitatifs ponctuels ou des slogans comme le « réarmement démographique » risque d’avoir peu d’effets, voire d’en aggraver la situation par rejet de l’idéologie associée (rhétorique nataliste et survie nationale).

Soutenir la fécondité implique ainsi de parler de droits à la parentalité plutôt que de devoirs, de viser la réalisation des désirs plutôt que la hausse des chiffres, de cibler autant les hommes que les femmes, et de reconnaître aussi le droit de ne pas avoir d’enfant.

Il s’agit en d’autres mots de permettre aux personnes qui souhaitent des enfants de les avoir dans de bonnes conditions.

La fécondité comme révélateur social

La fécondité est un indicateur de la capacité d’une société à offrir à ses membres des conditions favorables pour se projeter dans l’avenir.

Dans ces conditions, l’enjeu du « déclin de la fécondité » concerne moins la baisse du nombre d’enfants en soi, que la fragilisation de cette capacité de projection. La société doit offrir des conditions permettant aux personnes qui souhaitent des enfants de les avoir et de les accompagner sans que cela ne mette en péril leur équilibre individuel, conjugal, familial, professionnel ou économique.

La Conversation Canada

Laurence Charton a reçu des financements de CRSH, FRQ, INRS, Secrétariat à la condition féminine (gouvernement du Québec).

ref. Moins d’enfants, mêmes désirs : que révèle la baisse de la fécondité ? – https://theconversation.com/moins-denfants-memes-desirs-que-revele-la-baisse-de-la-fecondite-277345

AI chatbots can prioritize flattery over facts – and that carries serious risks

Source: The Conversation – USA (3) – By Nir Eisikovits, Professor of Philosophy and Director of Applied Ethics Center, UMass Boston

Sycophancy eats away at truth and trust. Andriy Onufriyenko/Moment via Getty Images

In the summer of 2025, OpenAI released ChatGPT 5 and removed its predecessor from the market. Many subscribers to the old model had become attached to its warm, enthusiastically agreeable tone and complained at the loss of their ingratiating robotic companion. Such was the scale of frustration that Sam Altman, OpenAI’s CEO, had to acknowledge that the rollout was botched, and the company reinstated access.

Anyone who’s been told by a chatbot that their ideas are brilliant is familiar with artificial intelligence sycophancy: its tendency to tell users what they want to hear. Sometimes it’s very explicit – “that is such a deep question” – and sometimes it’s a lot more subtle. Consider an AI calling your idea for a paper “original,” even if many people have already written on the same topic, or insisting that your dumb idea for saving a tree in your garden still contains a germ of common sense.

AI sycophancy seems harmless, maybe even cute, until you imagine someone consulting a chatbot about a weighty question, like a military strategy or a medical treatment. We study the impact of extensive human interactions with chatbots, and we recently published a paper on the ethics of AI sycophancy. We believe this tendency harms people’s ability to tell truth from fiction, and is psychologically and politically dangerous.

Flattery over facts?

In the simplest terms, sycophancy is the tendency to prioritize approval over factual accuracy, moral clarity, logical consistency or common sense. All AI models suffer from this trait, although there are some tonal differences between them. Open AI’s ChatGPT is often warm and affirming; Anthropic’s Claude tends to sound more reflective or philosophical when it agrees with you; and xAI’s Grok is insistently informal, even jocular.

Politeness and adapting to someone’s communication style are not the same as sycophancy. Neither is using diplomatic language to convey sensitive information. A chatbot can be tactful without becoming sycophantic, just like a person can. Unlike people, though, AIs can’t be aware of their own sycophancy, because they are not – so far – aware of anything at all. Calling AIs sycophantic describes their patterns of behavior, not their character traits.

The problem stems from the architecture of chatbot technology and the sources it draws from. Models are sycophantic because a great deal of language use on the internet – the raw material that chatbots learn from – displays sycophantic features. After all, humans often communicate with each other in sycophantic ways.

Second, the training process to fine-tune AI models’ responses includes a kind of “quality control” carried out by human supervisors. This training method is known as “reinforcement learning from human feedback,” and it involves people rating chatbots’ comments for appropriateness and helpfulness. Human beings often are subject to an “agreeableness bias”: Our own preference toward sycophancy rubs off on models as we train them.

Someone whose face is out of the frame types with one hand on a laptop while holding up a laptop with a chatbot screen.
Because of our own human bias for agreeableness, training can reinforce AI’s sycophancy.
d3sign/Moment via Getty Images

Finally, it’s hard to deny that sycophancy renders chatbots more likable. That, in turn, increases the chance that a given user will keep using it. It also increases the technology’s ability to extract user data, assuming that people are more likely to divulge information to a friendly bot.

Truth and trust

Why is this phenomenon so troubling?

Let’s begin with AI sycophancy’s epistemic harms: how it hurts human users’ capacity to know the truth.

The quality of any decision depends on a clear grasp of the facts pertaining to it. A general inquiring about the combat-readiness of an infantry division needs straightforward information. A CEO considering a merger with a competitor needs an honest assessment of the market conditions. A public health leader needs to know the real risk that an emerging pathogen poses.

In all those cases, telling leaders what they might like to hear instead of the truth could lead them to make dangerous decisions. And the same is true in more humdrum contexts. People need to have the best information available before choosing a job, picking a major, buying a house or deciding on a medical procedure.

In our February 2026 paper, we argue that sycophancy is also psychologically damaging. And that is true whether it comes from a person or from a chatbot. You never quite know if your very obliging interlocutor is being nice because they like you or because they want something. A shadow of suspicion creeps in: “Could my ideas really be that brilliant?” “Are my jokes really that hilarious?” This background music of doubt undermines the quality of the interaction.

Sycophancy also undermines people’s capacity to know their own minds. If conversation partners – human or artificial – keep telling you how smart, funny and insightful you are, it damages your ability to identify your own weaknesses and blind spots.

The psychological harms are compounded as people develop relationships with chatbots. The sycophancy of these models profoundly limits the kind of “friendship” you can have with them. In his classic account of friendship, Aristotle wrote that real friendship, which he calls a friendship of virtue, is based on trust and equality between the friends. You can’t trust a sycophant, because he doesn’t tell you the truth. And since he only tells you what you’d like to hear, he doesn’t put himself on an equal footing.

A teenage girl wearing headphones sits on a bench, looking toward another girl with her headphones around her neck a few inches away.
AI conversations aren’t great prep for human ones.
Natalia Lebedinskaia/Moment via Getty Images

More importantly, interactions with sycophantic chatbots impart all the wrong habits for navigating the world of human relationships, where friction, disagreement, boredom and different opinions than your own are prevalent.

AI sycophancy carries political risks as well. The success of liberal democracies has, traditionally, depended on the strength of their empirical and meritocratic mindset: on the ability of officials and citizens to identify, share and act on the truth.

Historian Victor Davis Hansen famously attributed some of the Allies’ success in World War II to their ability to quickly recognize and address the faults of their strategic bombing campaigns. Lower-ranking officers were able to tell their superiors what wasn’t going well and argue forcefully for changing course. That was a real advantage over authoritarian competitors.

Reining it in

What can we do to reduce the risks?

One promising approach is AI lab Anthropic’s embrace of what the company calls Constitutional AI: the attempt to teach chatbots to follow principles rather than mirror user preferences.

But beyond technical innovations, it’s important to consider the policy side. One idea is to require AI companies to run and then publish sycophancy audits of their models – tests that show how well their products meet honesty benchmarks. We would argue that AI labs should also disclose sycophancy-related risks that emerge while training and testing their models, and the mitigation efforts they have undertaken.

Some responsibility is on the users and their teachers: Schools and universities should be paying close attention to sycophancy as part of their AI literacy programs. But courts can also consider holding AI labs responsible for harms traceable to the sycophancy of their products, much as they are now contemplating social media companies’ responsibility for the addictive design of their platforms.

As people interact more with chatbots, asking for advice about everything from whether your shoes go with your pants to how countries should conduct wars, the impact of AI’s sycophantic behavior is likely to become dramatic. Our intellectual, psychological and physical well-being requires taking this algorithmic vice very seriously.

The Conversation

The Applied Ethics Center at UMass Boston receives funding from the Institute for Ethics and Emerging Technologies. Nir Eisikovits serves as the data ethics advisor to MindGuard, a startup focused on AI integration into companies’ workflow.

Cody Turner is a fellow at the Institute for Ethics and Emerging Technologies.

ref. AI chatbots can prioritize flattery over facts – and that carries serious risks – https://theconversation.com/ai-chatbots-can-prioritize-flattery-over-facts-and-that-carries-serious-risks-274298

When immigration detention becomes a system of concentration: Lessons from research on 150 historical cases

Source: The Conversation – USA – By Alex Braithwaite, Distinguished Professor & Director, School of Government & Public Policy, University of Arizona

Barbed wire surrounds the GEO Group ICE detention facility in Adelanto, Calif. on July 10, 2025. Patrick T. Fallon/AFP via Getty Images

The phrase “concentration camp” is freighted with dark historical meaning. Most people hear it and instinctively think of concentration camps used by the Nazis to exterminate Jews and other minority populations during the Holocaust.

But the use and name of concentration camps originated far earlier. In the late 1800s, Spanish military officials used concentration camps – reconcentrados – during their 1896–97 Cuban campaign to isolate civilians from rebels, resulting in widespread death and disease.

We are scholars whose research into international relations and conflict includes studying historical and modern uses of these systems of camps as a form of repression.

In recent peer-reviewed research, we identified four characteristics that define what qualifies as a concentration camp system: targeting groups of civilians for imprisonment; enclosed spaces where the state controls who enters and exits; departure from standard detention practices; and abuse and neglect. We then created a dataset detailing 150 systems of camps used globally since 1896 that fit this criteria. This includes the U.S. internment of more than 125,000 Japanese immigrants and Japanese American citizens during World War II, the Argentine military junta’s use of camps in their mid-1970s campaign to reorganize society, and Vladimir Putin’s use of so-called filtration camps in Russia’s war against Ukraine.

Our use of the term “concentration camp” is not meant to sensationalize or diminish its historical meaning, particularly as it relates to the Holocaust.

Rather, identifying such systems early is how the concept of “never again” – the promise to prevent mass atrocities, such as genocide, and combat extremism – can be translated into meaningful policy action from the public and policymakers.

Based on our criteria, we believe the network of detention facilities maintained by U.S. Immigration and Customs Enforcement fits into this broader definition of a system of concentration camps.

The evolution of concentration camps

After the use of concentration camps by the Spanish in Cuba, British officials adopted the practice in southern Africa during their counterinsurgency campaign against the Boer population – descendants of Dutch, French and German Protestant settlers – at the turn of the 20th century. The British detained 110,000 Boers and 37,000 indigenous Blacks in their network of 120 camps. At least 27,000 Boers and 14,000 Blacks died as a result of rampant disease and insufficient food supplies.

By the time major German military operations in Eastern Europe began in 1939, states around the world had erected more than 30 systems of concentration camps, according to our research.

Yet the term soon took on an even darker meaning. Concentration camps were employed most infamously as part of the Nazi regime’s brutal genocide in the 1930s and ’40s. In its 12 years in power, the Nazi government opened more than 1,000 concentration camps in which it detained millions of individuals. In addition to facilitating the Nazi Holocaust and other group-targeted violence against minoritized and non-German populations, Nazi security forces used the camps to repress political opposition and provide labor to the German civilian and military economies.

Though few camp systems have reached the severity or scale of those used during the Holocaust, modern camps often pursue similar goals of ethnic cleansing and forced displacement, practices such as torture and an absence of due process.

In our study, we found 93 examples of systems of concentration camps used since the conclusion of World War II. This includes more than 1,200 camps erected by Chinese authorities in Xinjiang province as part of an expansive policy of discrimination against the Uyghur population there. The Chinese government has detained more than 1 million Muslim Uyghurs since at least 2017, stripping them of their traditions, cultures and languages.

Our 4 criteria further explained

Our research confirms that the word “concentration” is critical to describing these camps. Two key criteria of the camps are the concentration of large numbers of targeted civilians into spaces, which are then secured by small numbers of captors who control who enters and exits the camps.

A third criteria we examined identifies concentration camps as “irregular” insofar as they operate outside of legal frameworks that regulate prisons, refugee camps and immigration detention centers. Concentration camps are run by separate authorities that deny detainees due process, such as formal criminal charges, legal representation or a fair trial.

The last criteria we used as we evaluated camps was the presence of squalor and routine violence. Specifically, we looked for evidence that detainees regularly experienced at least two forms of abuse, including but not limited to torture, beatings, mass killing, sexual violence, psychological abuse, lack of food, lack of water, lack of shelter, lack of healthcare, overcrowding and spread of disease.

ICE detention centers

As of April 2026, there are more than 240 active ICE detention facilities across the U.S.

Migrants held in these camps are not free to leave, though some are given a choice: self-deport − agreeing to leave the country immediately − or remain in custody. Since the beginning of Trump’s second term, migrants have filed more than 34,000 habeas corpus petitions challenging their confinement without trial, exercising a constitutional right.

Based on the criteria we developed, ICE detention camps fit in the spectrum of a system of concentration camps.

Parents and children dressed in olive green outfits walk along a brightly lit hallway.
Families and their children walk along the halls of the T. Don Hutto Residential Center in Taylor, Texas, an ICE detention facility for families.
Robert Daemmrich Photography Inc/Corbis via Getty Images

Starting with the first criteria, groups of civilians are being targeted by ICE, often based on their perceived ethnicity.

Though ICE’s stated mission is to detain those without documented legal status, many arrests have been based on physical appearance and location rather than evidence of unlawful presence in the United States.

More than 272,000 people arrested by ICE in the first six months of Trump’s second term were booked into ICE detention facilities. While deportations are increasing at a rapid rate, at least 60,000 people remain in detention facilities as of April 2026 – neither released nor deported. These numbers easily exceed counts of individuals held in immigrant detention centers in earlier years.

Hundreds of U.S. citizens have been detained, without justification and against their will, by ICE. The number of individuals arrested in homes and communities, often without an arrest warrant signed by a judge, reached more than 400 people per day in October 2025.

In terms of the second part of our definition, these people are being concentrated in spaces where the Trump administration controls who, when and under what conditions people may enter or exit these facilities. Access has been restricted for lawyers, family members of migrants, journalists and members of Congress.

As for the third criteria, the ICE detention centers also operate separately from the U.S. Federal Bureau of Prisons. ICE detention is managed by the Office of Enforcement and Removal Operations under the Department of Homeland Security, in collaboration with private prison companies.

As of April 2026, more than 70% of migrants had no criminal conviction, while many of the remainder were held for minor offenses, such as traffic violations. Failure to provide trials for migrants, particularly those who do not pose these risks, is a departure from established norms.

Our framework’s final criterion is purposeful abuse or neglect. This includes the practice of inflicting direct physical harm or the failure to provide basic necessities – food, water, shelter, healthcare.

A white bus with blacked-out windows drives towards a large building.
A shuttle bus transports detainees outside the private prison company GEO Group’s ICE detention facility in Adelanto, Calif., on July 11, 2025.
Patrick T. Fallon/AFP via Getty Images

Numerous reports have highlighted cutoffs in payments to third-party medical providers who gave care to detainees and a 36% decline in mandated detention facility inspections by ICE’s internal Office of Detention Oversight. These actions have resulted in unsanitary conditions and medical neglect in these facilities. Twenty-three deaths were reported between October 2025 and March 2026, putting the current fiscal year on pace to be the deadliest in over 20 years.

As scholars, we argue that ICE detention centers meet the criteria for concentration camps. We do so not to be provocative but to provide precise language, rather than euphemisms, so people can heed the warnings of atrocities committed in the past.

As journalist Andrea Pitzer argues in her writing about concentration camps, the longer camps exist, the more they shift from a transient emergency measure to a permanent pillar of state function.

Malia Hirasa and Sydney Horton, undergraduate students at the University of Arizona, contributed to this story.

The Conversation

Alex Braithwaite received funding from the US National Science Foundation (NSF) through grant award 2213615.

Rachel D. Van Nostrand does not work for, consult, own shares in or receive funding from any company or organization that would benefit from this article, and has disclosed no relevant affiliations beyond their academic appointment.

ref. When immigration detention becomes a system of concentration: Lessons from research on 150 historical cases – https://theconversation.com/when-immigration-detention-becomes-a-system-of-concentration-lessons-from-research-on-150-historical-cases-277728

What’s in the price of a gallon of gas?

Source: The Conversation – USA (2) – By Robert I. Harris, Assistant Professor of Economics, Georgia Institute of Technology

Gas prices were well over $4 a gallon on April 28, 2026, in Brooklyn, N.Y. Spencer Platt/Getty Images

The U.S. Energy Information Administration expects nationwide retail gasoline prices to average near US$4.30 a gallon for April 2026 – the highest monthly average of the year. The political response has been familiar. Georgia has suspended its state gas tax, other states are weighing their own tax holidays, and the White House has issued a temporary waiver of a law known as the Jones Act in hopes of moving more domestic fuel to East Coast ports.

As an energy economist, I am often asked about what contributes to gas prices and what different policies can do to affect them.

The price of a retail gallon of gas is the sum of four things: the cost of crude oil, refining, distribution and marketing, and taxes.

In nationwide figures from January 2026, crude oil accounted for about 51% of the pump price, refining roughly 20%, distribution and marketing about 11% and taxes about 18%. That mix shifts with conditions: When crude oil prices spike, that can drive more than 60% of the price; when the price drops, taxes and logistics are larger shares of the cost.

Crude oil is the biggest ingredient

Because the price of crude oil is the largest element, most of the price at the pump is derived from the global oil market.

Usually, big swings in crude prices come mainly from shifts in global demand and expectations – not from supply disruptions, according to widely cited research in 2009 by the economist Lutz Kilian.

But what is happening in early 2026 with the war in Iran is one of the exceptions: a classic supply shock. Severe disruptions to shipping through the Strait of Hormuz and attacks on Middle East oil infrastructure have taken millions of barrels a day off the global market.

Most drivers generally can’t quickly reduce how much they drive or how much gas they use when prices rise, so gasoline demand doesn’t change much in the short run. That means a jump in crude costs tends to result in people paying more rather than driving less.

Refining, regulations and the California puzzle

Refining turns crude into gasoline at industrial scale. The U.S. doesn’t have a single gasoline market, though. Roughly a quarter of U.S. gasoline is a cleaner-burning blend of petroleum-derived chemicals called “reformulated gasoline,” which is required in urban areas across 17 states and the District of Columbia to reduce smog.

California uses an even stricter formulation that few out-of-state refineries make. California is also geographically isolated: No pipelines bring gasoline in from other U.S. refining regions.

California’s gasoline prices have long run above the national average, explained in part by higher state taxes and stricter environmental rules. But since a refinery fire in Torrance, California, in 2015 reduced production capacity, the state’s prices have been about 20 to 30 cents a gallon higher than what those factors would indicate.

Energy economist and University of California, Berkeley, professor Severin Borenstein has called this the “mystery gasoline surcharge” and attributes it to the fact that there isn’t as much competition between refineries or gas stations in California as in other states. California’s own Division of Petroleum Market Oversight says the surcharge cost the state’s drivers about $59 billion from 2015 to 2024. It’s not exactly clear who is getting that money, but it could be gas stations themselves or refineries, through complex contracts with gas stations.

A person stands near a long metal truck in front of a gas station.
A tanker truck delivers fuel to a gas station.
AP Photo/Erin Hooley

Getting the gas into your car

The distribution and marketing category covers the costs of everything involved in getting the gasoline from the refinery gate to your tank.

Gasoline moves by pipeline, ship, rail and truck to wholesale terminals, and then by local delivery truck to service stations.

At the retailer’s end, the key factors are station rent and labor, the cost to buy gasoline in bulk to be able to sell it, credit card fees of as much as 6 to 10 cents a gallon at current prices, and franchise fees paid to the national brand, such as Sunoco or ExxonMobil, for permission to put their branding on the gas station.

Most gas station operators net only a few cents per gallon on fuel itself – which is why many gas stations are really convenience stores with pumps out front. Borenstein and some of his collaborators have also documented that retail gas prices rise quickly when wholesale costs climb but fall slowly when wholesale costs drop.

The question of gas tax holidays

The federal government charges a tax on fuel, of 18.4 cents a gallon for gasoline and 24.3 cents a gallon for diesel. States charge their own taxes, ranging from 70.9 cents a gallon for gas in California to 8.95 cents in Alaska.

When gas prices rise, many politicians start talking about temporarily suspending their state’s gas tax. That does reduce prices, but not as much as politicians – or consumers – might hope. Research on past gas tax holidays has found that consumers get about 79% of the reduction in gas taxes. That means oil companies and fuel retailers keep about one-fifth of the tax cut for themselves rather than passing that savings to the public.

Gas tax holidays also reduce funding for what the taxes are designed to pay for, typically roads and bridges. That pushes road and bridge upkeep costs onto future drivers and general taxpayers.

There is an additional problem, too: Taxes on gasoline are supposed to charge drivers for some of the costs their driving imposes on everyone else – carbon emissions, local air pollution, congestion and crashes. But Borenstein has found that U.S. fuel tax levels are already far below the true cost to society. Removing the tax on drivers effectively raises the costs for everyone else.

A fisherman holds a pole in the foreground as an oil tanker sails by at sunset
Suspending the Jones Act allows foreign-based oil tankers to sail between U.S. ports.
AP Photo/Eric Gay

The Jones Act: A small number that adds up

The 1920 Jones Act is a federal law that requires cargo moving between U.S. ports to travel on vessels built and registered in the U.S., owned by U.S. citizens, and crewed primarily by U.S. citizens and permanent residents. Of the world’s 7,500 oil tankers, only 54 meet this requirement. Only 43 of these can transport refined fuels such as gasoline.

So, despite significant refining capacity on the Gulf Coast, some U.S. gasoline is exported overseas even as the Northeast imports fuel, in part reflecting the relatively high cost of moving fuel between U.S. ports.

Economists Ryan Kellogg and Rich Sweeney estimate that the law raises East Coast gasoline prices by about a penny and a half per gallon on average, costing drivers roughly $770 million a year. In light of the war’s effect on gas prices, the Trump administration has temporarily suspended the Jones Act requirements – an action more commonly taken when hurricanes knock out Gulf Coast refineries and pipeline networks.

What moves the number

The result of all these factors is that the price that drivers see at the pump mostly reflects the global price of crude, plus a stack of domestic costs, only some of which are inefficient.

Tax holidays give a partial, short-lived rebate. Jones Act waivers trim pennies, though permanent repeal may cause more fundamental changes, such as reduced rail and truck transport of all goods, which could lower costs, emissions and infrastructure damage associated with cargo transportation. Harmonizing fuel blends across states and seasons may lower prices somewhat, but likely at the expense of increased emissions.

Ultimately, the best protection against oil price shocks is a more efficient gas-burning vehicle, or one that doesn’t burn gasoline at all. In the meantime, the best I can offer as an economist is clarity about what that $4.30 actually buys.

The Conversation

Robert I. Harris does not work for, consult, own shares in or receive funding from any company or organization that would benefit from this article, and has disclosed no relevant affiliations beyond their academic appointment.

ref. What’s in the price of a gallon of gas? – https://theconversation.com/whats-in-the-price-of-a-gallon-of-gas-281494

AI data center boom is leaving consumer electronics short of chips − even though they don’t use the same kinds

Source: The Conversation – USA (2) – By Vidya Mani, Associate Professor of Business Administration, University of Virginia; Cornell University

It takes a huge investment to be able to manufacture computer chips like these. Annabelle Chih/Getty Images

The boom in data center construction is taking up much of the supply of high-tech components, especially processor and memory chips. This demand is squeezing consumer device makers, which are having trouble acquiring enough chips.

This is happening even though data center servers and smartphones use different types of chips. The key distinction between consumer electronics and data centers is what they need chips to be optimized for. Smartphones and PCs require low power use, thermal efficiency and tight integration. Data centers that run AI systems such as large language models, or LLMs, require maximum compute power, memory bandwidth and storage throughput.

To meet these needs, consumer devices tend to rely on systems-on-a-chip – chips that combine processing and storage – with dynamic random access memory, or DRAM, and NAND, a type of nonvolatile memory. In contrast, AI servers rely on graphics processing units, or GPUs, or other accelerator processors combined with high-bandwidth memory chips.

I study global supply chains and how businesses respond to market constraints within these supply chains. The reason for the consumer electronics supply crunch has to do with the nature of the chip market: its concentration and high costs and how it responds to boom-and-bust cycles.

AI is not replacing consumer electronics; it is reorganizing the chip market around new priorities for specific chip characteristics. Data centers are pulling capital and scarce memory capacity toward the production of accelerator processors and high-bandwidth memory and the data handling and electronics equipment that surround them.

Chipmaking explained.

A winner-takes-most industry

Chip manufacturing behaves less like a competitive commodity market and more like a layered oligopoly. Scale matters because the leading firms can reinvest in research, improve yields, secure equipment and deepen customer relationships. In the case of graphics processor chips, designers such as NVIDIA, which has 85% market share, depend on advanced semiconductor foundries such as TSMC, which has more than 70% market share, to manufacture chips using extreme ultraviolet lithography machines from ASML, a monopoly.

A small number of producers both design and manufacture memory chips. Currently, three companies – Samsung, Micron and SK Hynix – hold a majority market share in the memory chips market. Long development cycles, extremely high fixed costs and the need for technological leadership reinforce concentration over time.

Consumer electronics firms such as Apple, along with other technology firms such as Amazon, Google, Microsoft and Xiaomi, increasingly design their own processor chips, because these chips shape the user experience, AI performance, power efficiency and system-level differentiation. Manufacturing memory chips, by contrast, is extraordinarily capital-intensive; requires high precision, efficiency and production line utilization; and is dominated by a few incumbent suppliers.

Since 2000, the memory chip industry has moved through repeated cycles of overcapacity and undersupply: the post-dot-com collapse, the 2007-09 glut, the tighter 2010s after consolidation, the severe 2022-23 downturn, and the AI-driven tightness of 2024-25. This has led to high levels of concentration in the industry and chipmakers that are hesitant to add capacity. Producers often operate chip fabrication plants, or fabs, at or near capacity due to high fixed costs. The risk of having expensive facilities go underused keeps chipmakers from bringing new fabs online in lockstep with demand increases.

Consolidation has reduced the number of major suppliers, who now increasingly direct investment toward higher-margin products rather than broadly adding capacity. That shift is important for understanding why AI demand is tightening chip supplies even as demand for consumer electronics continues to grow.

The most advanced computer chips are made with a machine manufactured by one Dutch company.

How the AI data center boom redirects capacity

The AI boom has changed memory demand from a broad consumer cycle into a more segmented market centered on high-bandwidth memory chips. In 2023, Micron cut capital spending and the company’s fabs operated below levels needed to justify their cost. By 2026, however, Micron was reporting strong AI demand, record data center DRAM revenue and rapidly rising high-bandwidth memory sales.

This shift matters because the market for supplying memory cannot respond quickly. Opening new fabs requires years of planning, large capital commitments and investments in advanced process equipment and skills. Memory chip manufacturers are likely to remain cautious about expanding capacity even as their profitability improves, with 2026 spending focused more on technology upgrades and high-value products than on large increases in chip supply.

In practical terms, AI is not simply lifting all memory demand equally; it is redirecting scarce capacity toward massive, or hyperscale, data centers and server markets first.

Can consumer electronics catch up?

Consumer electronics can catch up, assuming the manufacturers can weather the cost increases from tariffs and geopolitical pressures. One way they could is by making investments to enable small AI language models to run on consumer devices, a move analysts expect the companies to attempt.

Apple shifted a growing share of U.S.-bound iPhone production out of China to India and moved much of its iPad, Mac, Apple Watch and AirPods assembly for the U.S. market to Vietnam to lower the company’s tariff burden. Yet relocation does not eliminate cost pressure. Manufacturing iPhones in India still costs roughly 5% to 8% more than in China, and in some cases closer to 10%, because supplier ecosystems, logistics and production efficiency remain stronger in China.

Rising geopolitical tensions between the United States and China led to supply constraints and export controls on critical minerals and chip components, raising input costs for consumer electronics manufacturers. This led to higher total import costs and reduced margins for firms unable to pass costs fully to consumers, leading to further consolidation in supply.

Consumer devices do not need to replicate data center infrastructure to offer AI on their products. Their opportunity lies in running small language models on-device for summarization, rewriting, search, assistance and lightweight reasoning. Doing so, however, creates a distinct hardware requirement. Phones and laptops need to incorporate multiple functions on the same chip, combining processing capability with fast local memory and enough storage to keep on-device AI responsive. Apple’s current device requirements for the company’s AI, Apple Intelligence, also show that older phones often lack the compute power and memory needed for useful on-device AI.

To adopt AI, device makers need to redesign their products with higher-end chips – both processors and memory – that can piggyback on the AI model-oriented growth in the chips market driven by the data center boom. Such a shift by the device makers could also provide a useful backstop for the memory chipmakers in case the projected AI and data center growth does not materialize in the medium to long term, a boom-and-bust cycle that memory chipmakers have had to endure many times in the past.

aerial view of a pair of sprawling industrial buildings
Chipmakers have been devoting much of their precious manufacturing capacity to lucrative AI chips that are filling new data centers, like this Meta facility in Stanton Springs, Ga.
AP Photo/Mike Stewart

What this means for the wider economy

The AI and data center boom is redistributing capital, supplier attention and pricing power across the broader economy. Sectors with limited purchasing leverage are especially vulnerable when chip supplies tighten. For example, medical technology accounts for less than 1% of the overall chip market, leaving essential equipment manufacturers exposed during shortages.

In contrast, sectors linked to power delivery and digital infrastructure may benefit from the boom because they try to keep up with demand for cloud services and electrification. The International Energy Agency estimates that data centers consumed about 415 TWh of electricity in 2024 and notes that AI is accelerating the deployment of high-performance servers, which implies stronger demand for the grid, storage, cooling and networking equipment around them.

For the consumer electronics industry, the strategic task is not to try to match the AI data centers chip for chip but to build differentiated, energy-efficient, on-device AI services while managing higher supply chain and tariff risks.

And for consumers looking to buy phones, games and laptops, because of high demand from data centers, the next few years are likely to bring higher prices, shortages and delayed product releases.

The Conversation

Vidya Mani has received funding from LMI. I am a Senior Research Fellow at the Inter-American Dialogue and a member of GRI

ref. AI data center boom is leaving consumer electronics short of chips − even though they don’t use the same kinds – https://theconversation.com/ai-data-center-boom-is-leaving-consumer-electronics-short-of-chips-even-though-they-dont-use-the-same-kinds-277069