The most in-depth analysis to date of America’s current political polarization and the forces that led to a Trump presidencyAlan I. Abramowitz has emerged as a leading spokesman for the view that our current political divide is not confined to a small group of elites and activists but a key feature of the American social and cultural landscape. The polarization of the political and media elites, he argues, arose and persists because it accurately reflects the state of American society. Here, he goes further: the polarization is unique in modern US history. Today’s party divide reflects an unprecedented alignment of many different divides: racial and ethnic, religious, ideological, and geographic. Abramowitz shows how the partisan alignment arose out of the breakup of the old New Deal coalition; introduces the most important difference between our current era and past eras, the rise of “negative partisanship”; explains how this phenomenon paved the way for the Trump presidency; and examines why our polarization could even grow deeper. This statistically based analysis shows that racial anxiety is by far a better predictor of support for Donald Trump than any other factor, including economic discontent.