Using fears of Catholicism as a mechanism through which to explore the contours of Anglo-American understandings of freedom, Anti-Catholicism in America, 1620–1860 reveals the ironic role that anti-Catholicism played in defining and sustaining some of the core values of American identity, values that continue to animate our religious and political discussions today. Farrelly explains how that bias helped to shape colonial and antebellum cultural understandings of God, the individual, salvation, society, government, law, national identity, and freedom. In so doing, Anti-Catholicism in America, 1620–1860 provides contemporary observers with a framework for understanding what is at stake in the debate over the place of Muslims and other non-Christian groups in American society.