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This thread's gone a bit OT with everyone suggesting more chaps who could have died in WWI. So let's take that to its extreme.
ITTL the OTL survivors died during the war and OTL's dead survive. So no Byng in Canada, no Ludendorff or Hitler in Germany, no Mussolini in Italy, nor Pétain in France. It's a clean slate, people. Scribble on it!