Polarization is at an all-time high in the United States. But contrary to popular belief, Americans are polarized not so much in their policy preferences as in

The partisan divide in the United States has widened to a chasm. Legislators vote along party lines and rarely cross the aisle. Political polarization is person

American political observers express increasing concern about affective polarization, i.e., partisans' resentment toward political opponents. We advance debates

The psychology behind political partisanship: “The kind of research that will change not just how you think about the world but how you think about yourself.�

This volume provides the first comprehensive overview of how political scientists have used experiments to transform their field of study.