How do social movements die? Some explanations highlight internal factors like factionalization, whereas others stress external factors like repression. Christian Davenport offers an alternative explanation where both factors interact. Drawing on organizational, as well as individual-level, explanations, Davenport argues that social movement death is the outgrowth of a coevolutionary dynamic whereby challengers, influenced by their understanding of what states will do to oppose them, attempt to recruit, motivate, calm, and prepare constituents while governments attempt to hinder all of these processes at the same time. Davenport employs a previously unavailable database that contains information on a black nationalist/secessionist organization, the Republic of New Africa, and the activities of authorities in the U.S. city of Detroit and state and federal authorities.