Which organization,formed in 1920,was the precursor to the United Nations?

Question

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The League of Nations was formed in 1920 after World War I and was the first international organization dedicated to maintaining peace and resolving conflicts between nations. Although it ultimately failed in preventing World War II, it served as a precursor to the formation of the United Nations in 1945. The Concert of Europe was a grouping of European powers in the 19th century, the International Monetary Fund was established in 1944, and the Warsaw Pact was a military alliance of communist states in Eastern Europe formed in 1955.

Which Organization,formed in 1920,was the Precursor to the United Nations