An early crisis in the Cold War, known as the period of U.S.-Soviet tensions, from 1947 until the fall of the Soviet Union in 1991, occurred in Korea, a country that had been divided at the end of the Second World War. In June 1950, the army of Communist North Korea invaded U.S.-supported South Korea. President Harry S. Truman committed American troops to defend South Korea, and the U.S. made up the largest part of a United Nations force in that country...