It was unthinkable until it happened. On January 20, Donald J. Trump will take over as President of the United States. The impact of his coming presidency is just being felt in the U.S.—but the rest of the world will need to adjust to a President Trump as well. That won't be easy—Trump campaigned on overturning some of the most basic assumptions about U.S. foreign policy, from the importance of multilateral alliances like NATO to the importance of keeping a strong front against a resurgent Russia.
So what will it be be like? What should the friends and enemies of the U.S. expect? In this video, TIME foreign affairs columnist Ian Bremmer offers a guide to a world change—Trump's America in the world. It won't be like you expect.
Read More: Can NATO Survive a Trump Presidency?