December 7, 1941 (December 8 in Japan) that led to the United States' entry into World War 2
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Pearl harbor attack
Officially the Japanese attack on Pearl Harbor, December 7th, 1941
The surprise attack by the Japanese upon Pearl Harbor .
Pearl Harbor attack happened on the 7 December, 1941. So, the President of the USA was Franklin Delano Roosevelt.
Actually, it was largely because of the attack on Pearl Harbor. The US was already involved in the war financially, but they first deployed troops after that attack.