United States

War production

United States: manufacturing during World War II Two women working at a Douglas Aircraft Company plant in El Segundo, California, c. 1940.Farm Security Administration-Office of War Information photograph collection/Library of Congress, Washington, D.C. (fsa 8e01286)

United States: manufacturing during World War IIMen working on bombers at an aircraft plant in Baltimore, Maryland, 1942.Schomburg Center for Research in Black Culture, Photographs and Prints Division, The New York Public Library (1211919)Roosevelt had begun establishing mobilization agencies in 1939, but none had sufficient power or authority to bring order out of the chaos generated as industry converted to war production. He therefore created the War Production Board in January 1942 to coordinate mobilization, and in 1943 an Office of War Mobilization was established to supervise the host of defense agencies that had sprung up in Washington, D.C. Gradually, a priorities system was devised to supply defense plants with raw materials; a synthetic rubber industry was developed from scratch; rationing conserved scarce resources; and the Office of Price Administration kept inflation under control.

After initial snarls and never-ending disputes, by the beginning of 1944 production was reaching astronomical totals—double those of all the enemy countries combined. Hailed at the time as a production miracle, this increase was about equal to what the country would have produced in peacetime, assuming full employment. War production might have risen even higher if regulation of civilian consumption and industry had been stricter.

Scientists, under the direction of the Office of Scientific Research and Development, played a more important role in production than in any previous war, making gains in rocketry, radar and sonar, and other areas. Among the new inventions was the proximity fuze, which contained a tiny radio that detonated an artillery shell in the vicinity of its target, making a direct hit unnecessary. Of greatest importance was the atomic bomb, developed by scientists in secrecy and first tested on July 6, 1945.