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So, in OTL the highest combined stockpile of nuclear weapons in the world was a bit over 60,000 in 1986, of which maybe a bit over 20,000 at most would fly. While there are threads about how many nations could develop nuclear weapons, not much at all has been said about how large the arsenals themselves could have grown. Having extra nuclear-armed nations in this scenario would be nice but not necessary, what I'm looking for is a plausible way in which the world's usable nuclear stockpiles could be much larger.