heh, my bad (just looked it up again) but you're right:
Dec 7, 1941 - Japanese bomb Pearl Harbor; Hitler issues the Night and Fog decree.
Dec 8, 1941 - United States and Britain declare war on Japan.
Dec 11, 1941 - Germany declares war on the United States.
But Britain probably would have fallen if the US hadn't stepped in when we did. If we hadn't been sending supply ships to Britan even before we officially entered the war it would have fallen much earlier. Once again correct me if I'm wrong, and sorry about thread jacking
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