When did the u. s. join world war two?
The United States entered World War 2 on December 7, 1941 following the bombing of the US naval base at Pearl Harbor. The president at the time, Franklin D Roosevelt said it would be a day that would live in infamy.
December 8, 1941. The Japanese bombed Pearl Harbor the day before, December 7, 1941. Congress declared war the next day.
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