Discover how today’s rigidly partisan politics came to be, why we all participate in it, and what it means for America’s future—from star journalist, political commentator, and cofounder of Vox, Ezra Klein.

Over the past 50 years, our partisan identities have merged with our racial, religious, geographic, ideological, and cultural identities. Those merged identities have attained a weight that is breaking much in our politics and tearing at the bonds that hold this country together.

In this groundbreaking book, political journalist Ezra Klein shows how and why American politics polarized around identity in the 20th century, and what that polarization did to the way we see the world and each other. And he traces the feedback loops between our polarized political identities and our polarized political institutions that are driving our political system towards crisis.

Neither a polemic nor a lament, Klein offers a clear framework for understanding everything from Trump’s rise to the Democratic Party’s leftward shift to the politicization of everyday culture. A revelatory book that will change how you look at politics, and perhaps at yourself.