Great Decisions 2026

America and the World: Trump 2.0 Foreign Policy Trump’s return has marked a break from 80 years of U.S. foreign policy leadership, embracing an “America First” approach. This chapter explores the risks of isolation and diminished influence in relation to Trump 2.0 foreign policy. By G. John Ikenberry Trump Tariffs and the Future of the World Economy Trump’s aggressive trade and tariff policies have shaken global economic norms. What’s the rationale behind this radical shift in economic policy, and what are the implications for multilateral trade and geopolitics? By Michael Mastanduno U.S.-China Relations Relations with China remain tense, with tariffs, military modernization, and pressure on Taiwan. Does Trump have a coherent China policy, and will his tariffs on Rare Earth minerals be effective? What are America’s strategic options? By Oriana Mastro Ruptured Alliances and the Risk of Nuclear Proliferation U.S. alliance skepticism may drive countries like Japan and South Korea to reconsider nuclear options. What are the implications of the Trump administration’s rethinking of the U.S. alliance system for regional and global security? Will this new uncertainty alter the way allies and rivals in various regions make decisions about security and nuclear weapons? By Gideon Rose Ukraine and the Future of European Security With reduced U.S. support for NATO and Ukraine, Europe faces strategic uncertainty. The Trump administration has signaled an intention to reduce its security role in Europe. What are America’s stakes in NATO and Europe’s strategic dilemmas, and how might Europe respond?