The recent crisis of democracy in the United States and around the world has highlighted the value of both historical and comparative analysis and brought the subfields of American political development and comparative politics into frequent conversation with each other. In fact, these subfields emerged from common origins and draw on similar conceptual and methodological tools. This essay identifies the historical and intellectual connections between the two fields and suggests the emerging possibilities of bringing the cross-national study of political development onto a common platform. It then draws out some themes that emerge from this pathway and considers how these themes might point the way toward a more systematic enterprise that can help illuminate some of the most pressing challenges of a turbulent political era.