What has gotten us to this point of high political polarization and high income inequality? McAdam and Kloos offer a novel answer to what divides us as a country that focuses on the role social movements have in pulling parties to the extremes or pushing parties to the middle. They argue that the post-World War II period was unusual for its low levels of social movement activities and the resulting political centrism of the 1950s. The Civil Rights movement that followed – and the related backlash politics of the Southern Democrats – pushed the parties away from the center and toward regional realignment. Along the way, activists re-wrote party voting procedures that reinforced the power of vocal minorities within each party, thereby entrenching political polarization for the decades to come.

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