, United States (USA) (American Colonies)
1945 - December 4 - U.S. joins United Nations

The United Nations (UN) is an international organization founded on October 24, 1945, after World War II, by 51 countries committed to maintaining international peace and security, developing friendly relations among nations, and promoting social progress, better living standards, and human rights. The U.S. played a significant role in the formation of the UN, with President Franklin D. Roosevelt being a key proponent. The decision to join the UN on December 4, 1945, marked America's commitment to post-war international cooperation and diplomacy.

December 4, 1945

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