The Charter of the United Nations (UN Charter) of 1945 is the foundational treaty of the intergovernmental organization; the United Nations. It was signed at the San Francisco War Memorial and Performing Arts Center in San Francisco, United States, on 26 June 1945, by 50 of the 51 original member countries. (Poland, the other original member, which was not represented at the conference, signed it two months later.) It entered into force on 24 October 1945, after being ratified by the original five permanent members of the Security Council—the Republic of China (later replaced by the People's Republic of China), France, the Union of Soviet Socialist Republics (later replaced by the Russian Federation), the United Kingdom, and the United States—and a majority of the other signatories.