Kant's idea came to life after World War I, formed a new organization, the League of Nations, to achieve that goal. The league would have a total of 63 member nations, including France, the United Kingdom, Italy, Japan, Germany, and the Union of Soviet Socialist Republics (USSR). But the League had two major flaws. First, several of the world's most powerful countries were not members, most notably, the United States. Second, the League required consensus among its members to oppose aggression. When Japan, Italy, and Germany undertook military aggression would not agree to censure themselves. This aggression ultimately led to World War II. In the end, the League failed in its most basic mission, to prevent another world war.