Fifty years ago, Republicans turned on President Richard Nixon. Today, most of the party continues to stand by Trump. Why the difference? A rise in partisanship.

Over the past decade, illiberal populist leaders from across the political spectrum have won elections and taken power in many of the world’s biggest democracies, from the United States to India, the…

Many of the supposedly unprecedented features of contemporary politics have familiar echoes in earlier American history, and so the best mirror in which to see our present moment clearly could be our…