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When was the term "United Nations" first used?

Declaration of the United Nations

The term "United Nations", originally suggested by United States President Franklin Delano Roosevelt, was first used in the Declaration by United Nations, signed in Washington, D.C., on 1 January 1942—in the midst of the Second World War. In the Declaration, representatives of 26 nations fighting against the Axis Powers resolved to cooperate in winning the war. The signatories subscribed to the purposes and principles embodied in the Atlantic Charter, which had been signed by the President of the United States and the Prime Minister of the United Kingdom in 1941. 

Click here to read the full texts of the Declaration and Charter, and explore the evolution of the United Nations as recorded in the very first volume of the Yearbook, covering the 1946–47 period.