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Another thread on the Post-1900 forum got me thinking. Suppose that by September 1, 1939, the United States of America, United Kingdom, Empire of Japan, Soviet Union, and Third Reich are all well on their way to a deliverable (4000-5000 kg) and practical (15-25 kt) nuclear weapon, and that all five nations regard these bombs as simply bigger, better bombs (as they were regarded IOTL early on).

How does this happen? Who has to have a stroke of genius, when? Perhaps a couple unknown geniuses who IOTL died in the mud of Passchendale or in the snows of the Masurian Lakes return home ITTL?

How does WW2 go from here? Suppose that bombs start coming online after the fall of France, and all five nations at least have one deployable weapon by Barbarossa.
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