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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 lasted for 26 years; the United Nations (UN) replaced it after the end of the Second World War on 20 April 1946 and inherited a number of agencies and organisations founded by the League.he United States and Russia, for example, increasingly worked with the League. During the second half of the 1920s, France, Britain and Germany were all using the League of Nations as the focus of their diplomatic activity, and each of their foreign secretaries attended League meetings at Geneva during this period.