President Harry Truman succeeded president Roosevelt after his death in 1945, as he was his vice president. He would later win general elections to become President.
During his tenure, he oversaw the initial efforts for the economic rehabilitation of Europe after the Second World War. He also had to deal with the Korean War in 1950. After gaining the approval of the United Nations to get involved in the War, he sent troops to aid South Korea against the invasion of North Korea, which was supported by Communist China. His advantaged resided in the United States alliance with NATO (North Atlantic Treaty Organization), which also backed him in his military affairs to repel the North Korean Invasion.