The book examines the impact of urbanization on revolutionary processes and outcomes. It explores the causes and consequences of the urbanization of revolution in the late twentieth and early twenty-first centuries, using original data on revolutionary episodes since 1900, public opinion surveys, and engaging examples from around the world. The author investigates the struggle for control over public space, why revolutionary contention has grown more pacified over time, and how revolutions involving the rapid assembly of hundreds of thousands in central urban spaces lead to diverse, ad hoc coalitions that have difficulty producing substantive change.