One way or the other, we would have gone to war with Germany soon after Pearl Harbor. There were already plenty of insinuations that Pearl Harbor was done with the cooperation of the Nazis.
Maybe not.
The US did not want a two front war, mostly because no one who is sane does, and we really did not want to go to war in Europe again.
Yes there was a lot of push from the communists to get us into the European war but there was also a major pushback.
Hitler just did not give us a choice.