Born out of the ashes of the League of Nations following the beginning of World War II, the United Nations is an international organization dedicated to world peace and safety. Originally comprised of 51 countries, today that number has swelled to almost 200 nations working together toward economic development and social advancement. One of its earliest resolutions called for the elimination of nuclear weapons. Throughout its history, the organization has been both praised and condemned, receiving awards and criticism for its efforts. In this video, WatchMojo.com learns more about the history and functions of the United Nations.