The 38th parallel was the line of latitude that divided North and South Korea.
The Korean War
In 1950, North Koreans invaded South Korea with Soviet support. South Korea requested for help from the United Nations, and fifteen nations sent troops to aid South Korea. Douglas MacArthur lead the United Nations forces against North Korea. North Korea controlled most of the peninsula, then MacArthur attacked. The United Nations pushed North Korea's troops almost to the Chinese border. China sent 300,000 troops to go against the United Nations forces and capture Seoul. MacArthur called for a nuclear attack and was removed from command. In 1953, a cease fire was signed and a border at the 38th parallel was established. Nobody won the Korean War.