But in April nineteen forty-five, the scientists told the new president, Harry Truman, that they were almost ready to test their invention.Just three months later, they exploded the world's first atomic bomb in the desert in the southwestern state of New Mexico.Truman had to make a difficult decision. He knew the atomic bomb would cause widespread death and suffering if it was used on a Japanese city.But he was willing to do anything to avoid the need for American troops to invade Japan.In Japan, a new prime minister and government were searching for a way to end the war.But Truman believed that the Japanese were still not ready to surrender. And he felt it was his duty to end the war as soon as possible.On August sixth, nineteen forty-five, the first atomic bomb fell on the city of Hiroshima.Three days later, a second A-bomb fell on the city of Nagasaki.
