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The US was involved in World War II from the beginning, It was just not fighting, It was helping its allies with supplies, and doing reconnaissance. activities for Britain and other countries. The US almost got in the war early because of tactical errors, and even listed casualties in the year or so before officially joining the war.

The incident that forced the US to actually declare war was the attack by Japanese carrier planes on the US naval base at Pearl Harbor, Hawaii, on December 7, 1941. Congress declared war on Japan the following day.

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13y ago

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