Many people and organizations want peace. One organization that was set up to bring peace among the nations and try to make war a thing of the past was the League of Nations after World War I. When it did not stop World War II, it was replaced by the United Nations which tries to make the world peaceful. This means that if any member is attacked or invaded by another country without attacking that country first, the other members will come to help the country that was attacked first. This idea was used by the United Nations to defend both South Korea and Kuwait when they were attacked.