After reading “The Making Of The Atomic Bomb” I came away with the impression that development of nuclear bombs was 100% inevitable after 1938 when the German scientists proved splitting uranium isotope could sustain a chain reaction. All of the top physicists in the world instantly knew this could be used to create a super weapon. Every power in WWII had a nuclear program but only 1 had the resources to execute on it. Being the only country with a nuke is basically a checkmate on the world order and game theory demands it be created once it was known it was possible