To end the war which it did.
It's not clear what kind of alternative universe history book you're reading, but in this universe Truman did use the atom bomb against Japan.
The United States in Japan during WW2.
The reason was to end the war with Japan .
it was just retaliation for bombing pearl harbor
The main issue was for them to detonate in US soil.
the atomic bomb was used to kill thousands of people in Hiroshima, and Nagasaki, two main cities in Japan. the point of dropping them was to end the war through destruction and violence not peace.
To end the war and to collapse Japan's means to make war.
The President wanted to end the war and to collapse Japan's means to make war again.
Cheaper didn't come about money, it came with the total of human loses if we went over Japan's main land.
No, actually many historians believe the atomic bomb was one of the main causes why the cold war started. The fact that the us used the bomb in Japan without telling the rusians made stalin really angry, as he saw it as a manace and and insult.
Truman knew he had a weapon that would bring an end to the war, and probably would result in less American deaths. The war continued to lag on, and the Japanese, due to their belief that surrender meant failure and disgrace, would not give up. Dropping nuclear bombs on Japan gave them no other alternative than to surrender.
Because a mainland invasion would have been very costly, and the US wanted to test their new toy.