the bombing in Hiroshima and nagaski
The bombing was a good and bad thing. Because it helped in the war. Also it killed many innocent lives. But at least from the bombing it helped Japan surrenderd to save millions or more lives.
United states involvement in forming the united nations
More then million soldiers and civilians died. As a result of the war, United States was the most powerful country in the world. It would be up to the United States to help the world rebuild their countries.