Has anyone read any of the alternative time-line Science Fiction stories which speculate on how different the history of the 20th. Century would have been if only Hitler had got into art college??!
(And/or Stalin hadn't been expelled from Theoloogical College....mind you, I always think of Stalin as a 20th. Century version of The Grand Inquisitor.....)
Harry Turtledove has done quite a few very plausible stories on the basis of "what if...", World War II interrupted by an alien invasion, for example. The resulting scenario had most of Europe controlled by the Axis powers, the American continent divided between aliens and Allied powers, and Australia largely under the control of the aliens IIRC.