Examining interventions from the Spanish-American War through recent actions in Bosnia, Mark Peceny shows how the United States has encouraged the institution of free elections and other liberal reforms—often at the point of bayonets. Peceny applies statistical analysis to ninety-three cases of intervention and presents six case studies: Cuba and the Philippines after the Spanish-American War, Vietnam during the Kennedy administration, El Salvador during Reagan's first term, and Clinton's interventions in Haiti and Bosnia. By forging a synthesis of realist and domestic liberal approaches, Peceny illuminates the roles that both security concerns and liberal values play in the formulation and implementation of foreign policy. He shows how presidents often initially choose proliberalization policies to serve U.S. security interests and how Congress exerts pressure when presidents fail to take the initiative. Under these circumstances, he shows, presidents use the promotion of democracy to build domestic political consensus and to legitimize interventions. Although the United States has failed to promote democracy in most interventions, Peceny demonstrates that it has often had a profound and positive impact on the democratization of target states. His study offers new insight into the relationship between American power, the promotion of democracy, and prospects for the liberal peace in the decades to come.