Hans Morgenthau, Peaceful Change, and the Origins of American Realism

This article examines Morgenthau's switch from international law to international politics, arguing that it was fundamental to his emergence as a founder of postwar realism in the United States. More precisely, it sets this switch in the context of a far-reaching but largely overlooked debate among American jurists during the 1930s on the question of peaceful change: of how to revise an international order or major aspects of it by means other than war. This debate provided Morgenthau with a solution to the impasse reached by his project in international law before World War II, allowing him to transform what appeared to be a problem from the vantage point of international law into a structural element of an approach to international politics—of his realism.