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Why did Truman and his advisors have different opinions about the A-bomb?

During the Second World War, American losses in the battles against Japan were significant. The use of the atom bomb towards the end of the conflict changed America's fortunes. President Harry S Truman argued he was justified in using the weapon, but biographies released by his advisers years later argued Truman did not need to use it. So why did he decide to drop the bomb, and why did he portray events as he did in order to justify his use of the bomb?

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4 minutes