What date marked the beginning of americas involvement in ww2?

December 7th, 1941 after the bombing of Pearl Harbor, that’s when America decided to step in

Hey there,
The answer to your question is 7th December,1941 on the Pearl Habour.
And 405,399 Americans were killed in action while 671,278 Americans were severely wounded.

Hope this helps :))

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In the late fifteenth century, a major world power that established colonies in the era of old imperialism was france or germany or spain. their colonial activity was mainly limited to america or africa or asia.