But I think the bomb instead constitutes merely a first step in a new control by man over the forces of nature too revolutionary and dangerous to fit into old concepts.

As Secretary of State (1929–1933) under Republican President Herbert Hoover he articulated the Stimson Doctrine which announced American opposition to Japanese expansion in Asia. Roosevelt. During World War II he took charge of raising and training 13 million soldiers and airmen supervised the spending of a third of the nation's GDP on the Army and the Air Forces helped formulate military strategy and took personal control of building and using the atomic bomb.