Carnegie Endowment for International Peace

The United States feels roiled by polarization, and the philanthropic world is seized with debates about what to do. Some scholars claim that Americans are so polarized they are on the brink of civil war. Other polls suggest that voters agree on plenty of policies and that polarization is an illusion. Some philanthropists call for pluralism and civility, while others lean into activism, believing polarization is a byproduct of change toward a more just world. So, is the United States polarized or not? If it is, what is causing the polarization and what are its consequences? Should polarization be solved or tolerated?

This paper is intended to answer these questions. It opens with five facts about polarization in the United States today and what those imply for possible interventions. A literature review follows, organized chronologically to explain the scholarly shift from thinking of polarization as an ideological, policy-based phenomenon to an issue of emotion, as well as the emerging understanding of polarization as both a social phenomenon and a political strategy. This paper is organized as follows.