A Companion to American Foreign Relations is an authoritative volume of historiographical essays that survey the state of U.S. diplomatic history. The essays cover the entire range of the history of American foreign relations from the colonial period to the present. They discuss the major sources and analyze the most influential books and articles in the field. The contributors -- eminent scholars and experts in their subject matter--delve deeply into the literature and integrate discussions of new methodological approaches with more traditional diplomatic history. Each essay concludes with prospects for future work in the field.