By the time the US entered the war two years in, the Battle of Britain had been won, air authority established and Hitler had abandoned his plan to invade. I suggest that we would not now be speaking German, but the rest of Europe might be, if it wasn't for the invaulable assistance of the USA in joining us in the bid to liberate Europe.
Education is a wonderful thing.
I hate to disagree with you, but if America hadn't joined in (late, as usual) the rest of Europe would now be speaking Russian, comrade.