Final answer:
President Truman decided to drop atomic bombs on Hiroshima and Nagasaki to end the war quickly and avoid a costly invasion of Japan while forcing Japan to surrender.
Explanation:
President Truman's decision to drop atomic bombs on Hiroshima and Nagasaki was primarily influenced by the desire to end the war quickly and avoid the need for a costly full-scale invasion of Japan. This decision was also supported by the belief that the use of atomic bombs would force Japan to surrender swiftly, preventing further loss of lives.
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