Answer:
He wanted to end the Pacific war as soon as possible, he also didn't want it to involve an American ground invasion of the Japanese islands.
Step-by-step explanation:
The main reason was to end world war 2. The war was still going on and onl japan hasn’t surrendered. Truman decided to drop 2 atomic bombs on Japan to force them into surrendering and they did after the second bomb dropped. Many civillian lives were sacrificed to end world war 2.
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