It is not particularly controversial to observe that American politics is highly polarized, though there are interesting disagreements about whether it only feels this way because we have lost sight of the political battles of the American past. But if it is true that the American political present is particularly polarized, one should want an explanation. Perhaps part of the issue concerns the totalizing quality of politics in contemporary America–politics’ tendency today to swallow up all other features of life (including religion), features that in prior periods were able to hold their own relatively separate from the political sphere.

So seems to argue, at least in part, this new book, Uncivil Agreement: How Politics Became Our Identity (University of Chicago Press) by political scientist Lilliana Mason.

Political polarization in America is at an all-time high, and the conflict has movedUncivil beyond disagreements about matters of policy. For the first time in more than twenty years, research has shown that members 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.

With Uncivil Agreement, Lilliana Mason looks at the growing social gulf across racial, religious, and cultural lines, which have recently come to divide neatly between the two major political parties. 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 other 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. Bringing together theory from political science and social psychology, Uncivil Agreement clearly describes this increasingly “social” type of polarization in American politics and will add much to our understanding of contemporary politics.

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