December 8th 1941
The United States entered World War II after the Japanese attack on Pearl Harbour on 7th December 1941. The US declared war on the following day, 8th December 1941.
December of 1941
The Japanese bombed pearl harbour. The American public was outraged and pressured the government into war.
The US did enter into an undeclared shooting war with Germany in the fall of 1941 because Germany has declared war on the US.
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08 Dec 1941
Japan, Dec 7, 1941 (state of war existed); Dec 8, 1941 US declaration of war against Japan; Germany declared war on US December 11, 1941.
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Dec 07, 1941
December 8th 1941
1909 to 1944 The US entered World War 2 in December of 1941.
December 11, 1941.
Germany declared war on the US on 11 December 1941. In the hopes that Japan would declare war on Russia.