 President Truman rapidly dispatched our forces to engage in what he called a police action. U.S. and South Korean forces marched into North Korea. This led to Chinese forces entering the war in 1950. The war then bogged down into a bloody stalemate. In 1953, we signed a ceasefire that ended the conflict. The agreement also continued the division of North and South Korea at just about the same place as before the conflict. A ceasefire doesn't end a war, so the war technically continues.