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WWI - Congress declared war on Germany on April 6, 1917 and Austria-Hungary on December 7, 1917.

WWII - Congress declared war on Japan on December 8, 1941, and on Germany and Italy on December 11, 1941.

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What date US entered World War 1?

The US entered the war on April 6,1917


What was the date when the US entered the war?

You need to specify WHICH war- we have had more than one.


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