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Sep 17, 2018 at 10:04 comment added ColonelPanic This to me is the correct answer. Not all nations would have spies or even national programs to research nuclear weapons. But almost all countries would have some physicists, some weather balloons, a ship, and the know-how/equipment to collect the required fallout to determine the bomb's true origins. There would be little reason to suspect that the US added these isotopes purposefully to a conventional bomb (and the size of the explosion rules out TNT), therefore the existence of weaponized nuclear fission would have been revealed with very little effort.
Sep 15, 2018 at 5:05 history answered Loren Pechtel CC BY-SA 4.0