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| Share | Cite. League of Nations, former international organization, established by the peace treaties that ended World War I. Like its successor, the United Nations, its purpose was the promotion of international peace and security.eague of Nations, former international organization, established by the peace treaties that ended World War I.
History and Principles of the United Nations. Prior to the United Nations (UN), the League of Nations was the international organization responsible for ensuring peace and cooperation between world nations.It was founded in 1919 to promote international cooperation and to achieve peace and security..unctions of the United Nations Today. As it was in the past, the main function of the UN today is to maintain peace and security for all of its member states. Though the UN does not maintain its own military, it does have peacekeeping forces which are supplied by its member states.