An ugly strain of populism reared its head in America this year. After months of spewing sexist, racist, homophobic, and xenophobic rhetoric, Donald Trump stunned pollsters—and the citizens whose ballots earned Hillary Clinton the popular vote— by winning the White House. Accusations of corruption, fraud, and sexual assault could not halt the reality TV star’s candidacy, seemingly yanked from a Black Mirror plot, nor could his promises to tear up international treaties and alienate allies. Nativist politics won out, and Americans joined other populations, including Brexit supporters and Colombians who rejected the long-awaited peace deal, in voting against their self-interest. Through democratic means, fear surpassed reason repeatedly in 2016, leaving many wondering who will handle the unprecedented crises that the world faces—the war in Syria, mass migration, climate change—and how.…