The USA, being brave and noble, attempted to stop the spread of communism. North Korea, a Communist supported country, tried to spread its stupid ideals by taking over south Korea. The US didn't let them and we were able to successfully defend off against the dumb communists. The 38th parallel divided the countries of North Korea and South Korea into communist and democratic countries. North Korea was backed by the USSR and South Korea was backed by the US. The effect was that South Korea remained democratic and communism was contained.