re: On this day in 1945, the city of Nagasaki is wiped off the face of the earth...

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you are aware that things can be rebuilt, correct?

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Neither Hiroshima or Nagasaki were burned to the ground. There are still structures that were less than 1km from the blast that are still standing and used as museums.

As others have stated, a large part of the problem of Tokyo, in particular, is the amount of wood and paper that the Japanese used in residential construction. Fire kills, not just uranium and plutonium powered bombs.