The correct answer is:
Harry Truman’s difficult decision to use atomic bombs against Japan ended the war, saved lives, and secured a lasting peace.
On August 6, 1945, President Harry S. Truman having been warned by his advisers that any effort to penetrate Japan would result in terrible American losses, decided that the atomic bomb should be used to take the war to a rapid end. Finally, the American bomber Enola Gay released a five-ton bomb over Hiroshima.