Truman's primary reason for using atomic bombs was to end the war swiftly and avoid high casualties from a potential invasion of Japan.
Truman's main reason for using the atomic bombs on Hiroshima and Nagasaki was to bring a swift end to the war and avoid a prolonged, costly invasion of Japan. The estimated high casualty numbers projected for an invasion were a significant factor in his decision.
Many American officials supported Truman's decision, believing that the use of the bombs would hasten Japan's surrender and ultimately save lives on both sides. However, the morality and necessity of using atomic weapons remain highly debated topics in history.
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