Why might president truman have made the decision to drop the second atomic bomb on nagasaki?

Dropping the atomic bombs was a way of demonstrating America's power.  Also, the Japanese refused to surrender after the first bomb was dropped on Hiroshima so the President was following through on his threat.

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it provided for selection of government employees through competitive examinations. it also made it unlawful to fire or demote covered employees for political reasons or to require them to give political service or payment, and it set up a civil service commission to enforce the law.

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