The united states declared war on japan in 1941 because of an attack on which location or group?

On December 8, 1941, the United States Congress declared war (Public Law 77-328, 55 STAT 795) on the Empire of Japan in response to that country's surprise attack on Pearl Harbor the prior day. It was formulated an hour after the Infamy Speech of US President Franklin D. Roosevelt.

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Not sure this is a hard one huh