Assuming that the 3rd Reich was more victorious in Europe, was there any realistic chance of them later coming after the continental United States? How realistic is the possibility of this as portrayed in such timelines as 'The Man in the High Castle', in which both Japan and Germany manage to successfully invade and conquer the mainland U.S.A. ? Personally, I have doubts that it would have been anywhere near so successful if it had happened at all, but first and foremost I would like to discuss the possibility of an invasion occurring at all.