This article analyses the early American commitment to maintaining its neutral rights from several theoretical perspectives. Rejecting recent constructivist interpretations as unsubstantiated by the empirical evidence, it concludes that early American leaders largely mirrored traditional eighteenth century mercantilist practices to suit the interests of the United States. In particular, Jefferson's ‘two-tiered’ approach to the international system was based on astringent calculations of power rather than prevailing notions of ‘republicanism’. This ideology, while manifest in partisan rhetoric, had little measurable impact on the conduct of early American neutral rights policy. By focusing on the relationship of theory and practice in this context, this article offers a case study of the role of norms and ideology in the shaping of foreign policy in a republican state.