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World War II (1941–1945) was the most transformative event in twentieth-century American history. It ended the Great Depression, established the United States as the world's preeminent military and economic superpower, accelerated demands for racial equality, and reshaped the role of women in American society. The war also raised profound moral questions about the use of atomic weapons and the internment of Japanese Americans that continue to resonate.
Key Definition: The Arsenal of Democracy was President Roosevelt's phrase (December 1940) describing America's role as the chief supplier of military equipment to the Allied nations fighting the Axis powers, prior to formal US entry into the war.
American foreign policy in the 1930s was dominated by isolationism — the conviction, reinforced by disillusionment with World War I, that the United States should avoid entanglement in European conflicts.
| Isolationist Measure | Year | Purpose |
|---|---|---|
| Neutrality Act | 1935 | Prohibited arms sales to belligerent nations |
| Neutrality Act | 1936 | Extended the embargo; banned loans to belligerents |
| Neutrality Act | 1937 | Added "cash-and-carry" provision: belligerents could buy non-military goods but had to pay cash and transport them in their own ships |
| Nye Committee | 1934–1936 | Congressional investigation that blamed WWI intervention on munitions manufacturers ("merchants of death") |
Roosevelt gradually moved the country toward intervention through a series of steps:
The Japanese attack on Pearl Harbor (7 December 1941) killed 2,403 Americans, destroyed 188 aircraft, and sank or damaged eight battleships. Roosevelt's declaration that it was "a date which will live in infamy" unified a divided nation virtually overnight. Congress declared war on Japan on 8 December (with only one dissenting vote — Jeannette Rankin of Montana); Germany and Italy declared war on the US on 11 December.
The historian John Dower, in War Without Mercy (1986), argued that the Pacific War was characterised by racial hatred on both sides, with American propaganda depicting the Japanese in dehumanising racial stereotypes. This racial dimension distinguished the Pacific War from the European theatre and helps explain the willingness to use atomic weapons against Japan.
The mobilisation for war achieved what the New Deal could not: full employment and economic recovery.
| Indicator | 1940 | 1945 |
|---|---|---|
| Unemployment | 14.6% | 1.2% |
| GDP | $101 billion | $214 billion |
| Federal spending | $9 billion | $98 billion |
| National debt | $43 billion | $259 billion |
The federal government directed the economy through agencies such as the War Production Board (which allocated raw materials and converted civilian industries to military production) and the Office of Price Administration (which managed rationing and price controls).
Key industrial achievements included:
Exam Tip: When explaining why World War II ended the Depression, link the government's massive wartime spending to Keynesian economic theory — the idea that government spending can stimulate demand and employment. This was, in effect, the deficit spending that the New Deal's critics had opposed.
The war dramatically expanded women's participation in the workforce:
However, the changes had clear limits:
| Achievement | Limitation |
|---|---|
| Women entered skilled industrial jobs | Paid less than men for comparable work (approximately 65% of male wages) |
| Proved capable in every role assigned | Faced hostility from male co-workers and unions |
| Gained economic independence | After the war, many women were pressured or forced to surrender jobs to returning veterans |
| Wartime nurseries provided childcare | Most closed after the war ended |
The historian Ronald Takaki, in Double Victory (2000), emphasised that the war experience raised women's expectations and planted seeds for the later feminist movement, even if immediate post-war realities pushed many women back into domestic roles.
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