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Thought I'd bring up a familiar one -- taking a late PoD that keeps the Hitler and the Nazis from coming to power (say Hindenburg doesn't appoint him Chancellor), what happens?
How does the Weimar Republic cope with the Great Depression? How do European and world politics play out? How is world culture affected by never seeing the likes of Hitler leading a powerful nation, to say nothing of avoiding the horrors of WWII? And anything else I'm not thinking of...