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They joined the war. When the Japanese attacked Pearl Harbor, they committed an act of war. The US had no other option but to declare war on Japan, and in so doing declare war on Japan's allies, essentially Germany, and Italy. Joining the war, the US injected massive numbers of troops, equipment, and ordnance, as well as food and supplies for Britain and the other Allied Power Nations. Most importantly, the US made available massive industrial and production capabilities.

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12y ago

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