This paper examines the international context in which American social science was institutionalized in the generation after the Civil War, following the foundation of the American Social Science Association in 1865. The ASSA was modelled on an influential British forum, founded eight years previously, the National Association for the Promotion of Social Science. A comparison of these two organisations from the 1860s to the 1880s allows consideration of British intellectual and political influences on the first American social scientists. It also helps in the identification of the social and political attitudes of the well-born, cosmopolitan, and high-minded American reformers attracted to social science at this time. The theme of American exceptionalism has recently been emphasized when considering the motives and intentions of early social science in the United States. It is argued here that the replication in America of models of the new discipline which were first developed in Britain, is indicative also of a self-conscious internationalism among the American social-scientific community of this period. In addition to an institutional comparison, the article examines the careers and ideas of several representative figures in this process of Anglo-American liberal transference, among them the physician Dr. Edward Jarvis, the feminist Caroline Healey Dall, the jurist David Dudley Field, and the famed British interpreter of American experience, James Bryce. [ABSTRACT FROM AUTHOR]