International law has mainly been a product of liberal democracies since World War II. But democracy and liberalism are under assault from populists, economic nationalists, and autocrats. Tom Ginsburg, a professor of law and political science, asks what international law might look like if the global trend toward authoritarianism continues. He argues that today’s authoritarian regimes, including China, are using international law to promote their own survival, and may end up reshaping it in important ways.