How can citizens make sense of the complex mixture of durability and dynamism that animates American party politics? How should Americans understand—and come to terms with—contemporary partisan polarization and the democratic backsliding afflicting politics in the United States today? In this volume, contributors argue that the historical-institutionalist approach practiced by scholars of American Political Development (APD) offers enormous potential and can shed light on the paradoxical character of American party politics in general and the present conflicts plaguing the polity in particular. Parties, Power, and Change draws together a broad range of contributions from a new generation of historically oriented social scientists for the first time, and foregrounds political parties in the study of APD. By doing so, the volume highlights the ways in which party development has both been shaped by, and contributed to, changes in governing institutions and the democratic polity. The essays illuminate the developments that gave rise to salient features of the contemporary political landscape that occupy both academic and public discourse today, including shifts in ideology, group affiliations, and issue positions of the parties; changes in party structures; and partisan-driven democratic backsliding. Finally, this volume argues that, by viewing American politics through the lens of the historical development of party politics, readers can better understand the essential role that parties play in American history and see how parties can be mediating institutions that both sustain and undermine democracy. Contributors: Amel Ahmed, Gwendoline M. Alphonso, Julia Azari, Rachel M. Blum, Jeffrey D. Broxmeyer, Boris Heersink, Jessica Hejny, Adam Hilton, Daniel Klinghard, Didi Kuo, Matthew J. Lacombe, Verlan Lewis, Nicole Mellow, Sam Rosenfeld, Jeffrey S. Selinger, Daniel Schlozman.