
Itâs easy to assume that the plan all along was for the Manhattan Project, the unfathomably large US program to design and produce atomic weapons, to only build two atomic bombs. But this is not the case. The project had grown into a fully-fledged atomic weapon production line. Most of the resources used in the multi-billion dollar operation went towards gathering enriched uranium and plutonium, which was exceptionally hard to produce at the time.
https://www.warhistoryonline.com/war-articles/demon-core-atomic-bomb.html
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