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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.
The League of Nations was an international organization that existed between 1920 and 1946. Headquartered in Geneva, Switzerland, the League of Nations vowed to promote international cooperation and preserve global peace.t its height in 1934 and 1935, the League had 58 member countries. The member countries of the League of Nations spanned the globe and included most of Southeast Asia, Europe, and South America. At the time of the League of Nations, nearly all of Africa consisted of colonies of Western powers.