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Based on the excerpt, President Truman provides three reasons for the development and use of atomic bombs by the United States:
The atomic bombs were used in retaliation for the attack on Pearl Harbor and the mistreatment of American prisoners of war.
The atomic bombs were used to shorten the duration of the war and save the lives of young Americans.
The United States continued to use the atomic bombs until Japan was completely unable to make war, and only a Japanese surrender would stop them.