Britain was only in the early stages of rearmament when the war broke out, but after the fall of France the transition to a World-War-I-type command economy was precipitous. Churchill replaced some 60 interdepartment committees for war economics with the single Lord President’s Committee under Sir John Anderson. Within 18 months Anderson organized the most centralized and complete war mobilization of any nation. It included controls on trade, foreign exchange, wages and prices, and raw materials. The National Service Act of December 1941 outdid even the U.S.S.R. by making every man under 50 and every woman under 30 liable to government assignment. Of the 2,800,000 new war workers, 79 percent were female. The state also cut consumer production to a minimum: 67 percent of the work force was employed in war-related jobs. Once again, the British exercised financial responsibility by raising taxes, deferring wages, and compelling savings.

Even before the war, and despite the Depression, the American gross national product (GNP) of $88,600,000,000 dwarfed that of any other country. Under the impulse of war it increased by 1944 to $135,000,000,000, of which 40 percent was directed to military purposes. About 60 percent of all the munitions used by the Allies in 1944 was made in the United States. In addition to arming its own immense air and sea forces, the United States provided $32,500,000,000 in lend-lease support, including $13,500,000,000 to Britain and $9,000,000,000 to the U.S.S.R. Total U.S. production included 300,000 aircraft, 51,400,000 tons of shipping, 8,500,000 tons of warships, and 86,700 tanks. The government financed this phenomenal buildup largely through war bonds in the early years and later through taxation.

The American war effort was also achieved without the rigid centralized control of Britain. In January 1942 the War Production Board emerged, staffed with “dollar-a-year” volunteers from business, while the Office of War Mobilization (May 1943) under James F. Byrnes served less as a dictator than an umpire in matters involving labour, business, and the military.

The Soviet Union also made a stupendous economic effort in the war despite conditions as difficult as the American ones were favourable. Within a few months in 1941 the U.S.S.R. lost to the enemy over half its industrial capacity and richest farmland and countless skilled workers. Yet the Soviets rebounded quickly, relocating over 1,300 factories to the Urals region in an effort that involved perhaps 10,000,000 people. Coal, oil, electricity, and food never regained prewar levels, but arms production boomed. The Soviets managed to turn out 136,800 aircraft and 102,500 tanks by 1945, surpassing the Germans in both. The centrally directed Gosplan and party apparatus, of course, had initiated a ruthless command economy as early as 1928, and Soviet appeals to patriotism (as opposed to Marxism), the network of forced-labour camps, and severe austerity made the effort possible. Despite punishing taxation and subsistence wages (40 percent of the 1940 level) state income covered only half the budget over 1941–45, laying the basis for the inflation that would lead to postwar devaluation. The Soviet war economy, however, like that of the United States, prepared the country for postwar superpower status.

Japan’s strategy was similar to Germany’s Blitzkrieg in that the swift conquest of isolated territories was designed to create a self-sufficient empire capable of withstanding any blow from without. Once again, precise operational planning permitted Japan to increase weapons production steadily from the inception of a full war economy in 1942 to early 1945, when U.S. bombing intensified. By 1944, naval ordnance production was more than five times that of 1941 and aviation more than four and a half times. The Japanese, like the Nazis, exploited their conquered peoples and even more than the Nazis subjected prisoners of war to slavery or death. But the fact that attacking Pearl Harbor would “awaken a sleeping giant” was lost on Japanese planners. By 1944 military expenditures absorbed 50 percent of the Japanese GNP, a degree of concentration second only to that of the Soviet Union. Yet the United States, with half its effort diverted to Europe, still overwhelmed the Co-Prosperity Sphere.