The central argument of this book is that the deep partisan divide that exists among the politically engaged segment of the American public as well as among political elites and activists is, fundamentally, a disagreement over the dramatic changes that have transformed American society and culture since the end of World War II, and that continue to have huge effects in the twenty-first century. The challenges posed by technological change, globalization, immigration, growing racial and ethnic diversity, and changes in family structure and gender roles have produced diverging responses from
  
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