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They needed to demonstrate not only the awesome and terrible power of the bomb, but also that it could be accurately targeted (hence, two bombs).

• maratd 11y ago
  > but also that it could be accurately targeted I think it was more to prove that it wasn't a one-off ... that it was repeatable and could be used as many times as is necessary. But that too.
• dandrews 11y ago
  And perhaps, to demonstrate the will to use it.