The Chicago Council on Global Affairs has been tracking American views on foreign policy since the end of the Vietnam War. Last week, it released its 2025 survey—and the results point to a widening partisan divide on some of the most fundamental questions about America's role in the world.

That was not always the case. For most of the past 50 years, Democrats, Republicans, and independents largely agreed on the proper role of the United States in the world. There were always differences, of course, but they tended to exist at the margins. On big-picture questions—such as alliances and working cooperatively with other countries—there was broad consensus. That consensus began to shift in 2015 with Donald Trump's entry into the American political scene. Now, ten years later, this latest survey shows partisan divides that are deeper than ever. America's domestic polarization has finally caught up with its foreign policy.

To discuss these survey results, I'm joined by Jordan Tama, a professor at American University in Washington, DC, who specializes in the intersection of American public opinion and foreign policy. We begin by discussing the historical sources of bipartisan foreign policy consensus, before turning to a longer conversation about how and why that consensus has fractured—and what this shift suggests about the future of American foreign policy.

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For the past year and a half, South Sudan has been on the brink of a new civil war. A 2018 peace deal that ended the last civil war has been faltering, while the war across the border in Sudan has threatened to spill south.

According to my interview guest, Daniel Akech of the International Crisis Group, the tipping point has been breached. We are now in the early stages of a new civil war in South Sudan—one that may prove even more destructive than the 2013–2018 conflict, which left an estimated 400,000 people dead.

There are a number of reasons for this—not least the civil war in Sudan, which has decimated oil revenues that long underpinned South Sudan's political economy. And, as in the first civil war, ethnic tensions are being deliberately stoked, raising the prospect of mass atrocities.

We kick off by discussing recent events on the ground in South Sudan, including an offensive by opposition forces sparked by the arrest and prosecution of Riek Machar, a former vice president who led one side of the previous civil war. We then explore the potential trajectory of this conflict, how it is intimately tied to the war in Sudan, and the role of key regional actors.

South Sudan is a new country, having gained independence from Sudan in 2011—but just two years later, civil war erupted, killing hundreds of thousands, displacing millions, and destroying infrastructure across the country. This new outbreak of violence may lead to something just as bad— or worse — but has received little attention in the Western press.

One year ago, the United States was winning the global fight against HIV/AIDS. Thanks largely to American leadership, infections and deaths from HIV/AIDS have dropped precipitously over the past 20 years, ever since the U.S. government made combating the disease a global priority. Some once–hard-hit countries in sub-Saharan Africa were even on track to become AIDS-free by 2030.

But then, suddenly and without warning, Donald Trump issued an executive order on January 24, 2025 that all but ended U.S. funding for global HIV/AIDS relief. One year on, people have lost access to treatment, and the specter of a resurgence of HIV/AIDS—after years of steady decline—now looms. Meanwhile, the Trump administration is cutting bilateral deals with countries like Zambia, releasing health and development assistance in exchange for access to natural resources and mining concessions.

Joining me from rural Zambia is journalist Andrew Green, who is in the midst of a reporting project documenting the impact of these cuts on HIV/AIDS prevention efforts around the world. We kick off by discussing the historic role the United States played in the fight against HIV/AIDS before turning to what has been lost—and how countries across sub-Saharan Africa are responding.