This article uses the relationship between George Kennan and Dean Acheson as a lens to track a classic debate over the main lines of postwar American foreign policy, especially in regard to Europe and over such related issues as negotiations with the Soviets, German unification, and the size of and necessity for American conventional and nuclear forces. It clarifies that Kennan did not play the role of powerful architect whose planning provided the blueprint and instructions for building the structure of U.S. policy in Europe. Dean Acheson proved the essential builder of the structures which provided the framework for American foreign policy for four decades. In the process, this article clarifies the nature of the personal and professional dealings of the two men over the period from the end of World War II until Acheson's death in 1971.