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The US entered World War 2 after the Japanese attack on Pearl Harbour on 7 December 1941 and got out after the official surrender of Japan on 2 September 1945.
December 8th 1941
Japanese bomb naval base at Pearl Harbor, Hawaii on 07 Dec 1941
After the attack on Pearl Harbor on December 7th 1941, the following day America declared war on Japan and Germany. So they entered the war on December 8th 1941
the US joined the fighting in 1941 after the bombing of pearl harbour by the Japanese