Across the Euro-Atlantic world, political leaders have been mobilizing their bases with nativism, racism, xenophobia, and paeans to "traditional values," in brazen bids for electoral support. How are we to understand this move to the mainstream of political policies and platforms that lurked only on the far fringes through most of the postwar era? Does it herald a new wave of authoritarianism? Is liberal democracy itself in crisis? In this...