The Charter of the United Nations 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.lthough the Preamble is an integral part of the Charter, it does not set out any of the rights or obligations of member states; its purpose is to serve as an interpretative guide for the provisions of the Charter through the highlighting of some of the core motives of the founders of the organisation.