What would have happened if???

What would’ve happened if the ignorant man to left where in power on Sept.1 1939 instead of the astute leader on the right? If you read Fintan O’Toole’s column ( https://www.irishtimes.com/opinion/fintan-o-toole-trial-runs-for-fascism-are-in-full-flow-1.3543375 … ) in the Irish Times the U.S. may have been Germany’s partner instead of the U.K.’s