While Roosevelt was president he died, so Truman as vice president became president during World War ll was just about the end. Barely into Truman's presidency Adolf Hitler (the mind of the holocaust) commited suicide and the allies called victory in Europe. But in the Pacific the war was far from being over. It was going to have an American invasion over Japan. BUt while no one had noticed the U.S. and British started to make the world's most deadliest weapon... The Atomic Bomb! When they finished making and testing the bomb it was 1945. President Truman wanted to use the bomb against Japan.On August 6th and 9th of 1945 the U.S. dropped both of the bombs on two cities of Japan, Hiroshima and Nagasaki, killing more than 100,000 people and then many more for days because of the radiation the bombs gave off. Japanese emperor Hirohito agreed to surrender days later, bringing World War II to an end. Truman struggled through the Korean War, and was unable to bring it to a close. The Congress was begining to threaten him with impeachment. He didn't want to run for office again in 1952.