On June 25, 1950 the Korean War started when troops from North Korea invaded South Korea. The United Nations said that this invasion violated international peace. They demanded that the Communist North Koreans withdraw from South Korea. The Communist kept fighting so 16 countries form United Nations sent troops to help South Korea. Forty-one other countries sent military equipment and other supplies. The United States sent 90 percent of the troops that fought. About one million Koreans South Koreans civilians were killed and many millions were left homeless. About 580,000 UN and South Koreans troops were killed and 1,600,00 North Korean troops were killed.
The Korean War was one of the bloodiest wars in history. It ended on July 27, 1953 when the United Nations and North Korea signed an agreement. North Korea and South Korea have never signed a treaty. Today the United States still has military troops in South Korea in hopes of preserving peace.