The Trump effect on American politics needs no fancy explanation. He either inspires partisans to staple MAGA hats to their heads or causes them to pull their hair out in paroxysms of frustration. It’s more complicated around the globe, but President Trump puts his stamp on the politics of other countries, too, both overtly and subtly. Populists, nationalists and authoritarians look to Trump and know that they may proceed unchecked. Countries more committed to the decades-long liberal international order scramble to respond to scrapped cultural, institutional, diplomatic and policy norms. Will a stray nuke blow them up? A carbon-clogged climate fry them? In an upside-down Trump world where friends aren’t friends, enemies aren’t enemies, and yesterday’s deals are today’s kindling, nations must adjust.