A) The Roosevelt admin. favored Britain from day one of WW2. After the Brits got serious about taking out Hitler any dreams the western bourgeoise had of fascism erasing communism were DOA (I mean until they resurrected it themselves, but that's Cold War shit)

B) The idiot declared war on the US of his own volition. Fucker probably had a couple months for the yanks to be distracted with Japan.