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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 the first attempt at something like the United Nations that we now have. It was formed after WWI. It was meant to keep the peace in the world in two ways. First, it would give countries a place to talk about their differences. The United States was not part of it. 2  More importantly, the countries in the League did not take the idea of collective security seriously. 3  When countries attacked others, nothing was done. 4  For example, Italy attacked Ethiopia and Japan attacked China. 5  In both cases, nothing serious was done.