Political polarization in America is at an all-time high, and the conflict has moved beyond disagreements about matters of policy. Research has shown that, for the first time in more than twenty years, majorities of both parties hold strongly unfavorable views of their opponents. This is polarization rooted in social identity, and it is growing. The campaign and election of Donald Trump laid bare this fact of the American electorate, its successful rhetoric of "us versus them" tapping into a powerful current of anger and resentment. Lilliana Mason looks at the growing social gulf between the two major political parties along racial, religious, and cultural lines. She argues that group identifications have changed the way we think and feel about ourselves and our opponents. Even when Democrats and Republicans can agree on policy outcomes, they tend to view one another with distrust and to work for party victory over all else. Although the polarizing effects of social divisions have simplified our electoral choices and increased political engagement, they have not been a force that is, on balance, helpful for American democracy--back cover.