Nazis. I don't think so.
From what I have read the tide was already turning in favour of the Allies by the time the USA entered the war. It may have taken longer but possibly the results would have been the same.
Even if Germany had emerged victorious hopefully we are all civil enough to have eventually stood up against Nazism. And maybe we would have come up with a more robust and equitable system than the democracy/capitalism we have now. Maybe the world would ahve been a better place. Who can tell?