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The US had built 4 atomic bombs before the end of WW2 and detonated 3 of those. There were plans and facilities for building another 20 before the end of 1945 had they been needed.

  1. Gadget, detonated July 16, 1945 on a steel tower at the Trinity site in what is now White Sands Missile Range in New Mexico
  2. Little Boy, detonated August 6, 1945 over Hiroshima, Japan
  3. Fatman, detonated August 9, 1945 over Nagasaki, Japan
  4. unnamed, arrived in San Francisco on August 18, 1945 returned to Los Alamos (probably could have been dropped on Japan around August 25, 1945)
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9y ago

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