League of Nations
Organization for international cooperation established by the Allied Powers at the end of World War I. A league covenant, embodying the principles of collective security and providing for an assembly, a council, and a secretariat, was formulated at the Paris Peace Conference (1919) and contained in the Treaty of Versailles. The covenant also set up a system of colonial mandates. Headquartered at Geneva, the League was weakened by the failure of the U.S., which had not ratified the Treaty of Versailles, to join the organization. Discredited by its failure to prevent Japanese expansion into China, Italy's conquest of Ethiopia, and Germany's seizure of Austria, the League ceased its activities during World War II. It was replaced in 1946 by the United Nations.
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