The UN was formulated and negotiated among the delegations from the Allied Big Four ( the United States , the United Kingdom , the Soviet Union and China ) at the Dumbarton Oaks Conference from 21 September 1944 to October 7 , 1944 and they agreed on the aims , structure and functioning of the UN . After months of planning , the UN Conference on International Organization opened in San Francisco , 25 April 1945 , attended by 50 governments and a number of non-governmental organizations involved in drafting the UN Charter . " The heads of the delegations of the sponsoring countries took turns as chairman of the plenary meetings : Anthony Eden , of Britain , Edward Stettinius , of the United States , T. V. Soong , of China , and Vyacheslav Molotov , of the Soviet Union . At the later meetings , Lord Halifax deputized for Mister Eden , Wellington Koo for T. V. Soong , and Mister Gromyko for Mister Molotov . " The UN officially came into existence 24 October 1945 , upon ratification of the Charter by the five permanent members of the Security Council — France , the Republic of China , the Soviet Union , the UK and the US — and by a majority of the other 46 signatories
UN Conference on International Organization
United Nations Conference on International Organization
United Nations