Political Community in Revolutionary Pennsylvania challenges the ways we understand popular sovereignty in the American Revolution, demonstrating how ordinary citizens wielded significant political power. Previous histories place undue focus on either elite political thought or class analysis; on the contrary, citizens cared most about the establishment of a representative, publicly legitimate political process. Popular activism constrained leaders, creating a system through which governmental actions were made more representative of the will of the community. This book analyzes developments in Pennsylvania from 1774, and the passage of the Intolerable Acts, through to 1800 and the election of Thomas Jefferson. It examines the animating philosophy of the Pennsylvania state constitution of 1776, a “radical manifesto” espousing a vision of popular sovereignty in which government was devolved from the people only where necessary. The legitimacy of governmental institutions rested on their demonstration that they operated through popular consent, expressed in a variety of forms of popular mobilization. This book examines how early Americans interacted with the power structures shaping the world in which they lived, recasting the nature of the American Revolution and illuminating the origins of modern American political practice. It investigates how political mobilization operated inside and outside formal channels of government. Mechanisms of popular mobilization helped a diverse population mediate with governmental institutions, providing the foundation of early American power. Histories that ignore this relationship miss one of the most significant founding characteristics of the United States—the importance of popular politics and democratic practice in the establishment of American government.