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With a PoD no earlier than 1 September 1939, follow the pattern of WWI leading to WWII (21 years later, began roughly a month later in the year than the previous war, same general alliances of central Europe vs West and East) to create a plausible WWIII. Bonus points if you manage to get the usual Britain-France-later-the-USA-and-alongside-the-Russians vs Germany-and-friends setup. Be as crazy or as creative as you like, and I will accept people handwaving the a-bomb out of WWII (research stalls in the USA, Roosevelt ignores Einstein or something) in order to create a conventional WWIII that hopefully won't be between Russia and the USA.
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