The United Nations Conference on International Organization was convened in San Francisco from April 25 to June 26, 1945.
Fifty nations participated in the conference at the invitation of the four sponsoring governments, the United States, the
United Kingdom, the USSR, and China. The four sponsors invited to the conference those nations that had entered into a state
of war against one or more of the Axis powers and that adhered to the Declaration by United Nations of January 1, 1942. Forty-two
nations accepted the invitation, and after the conference began, Argentina, Denmark, the Belarussian Soviet Socialist Republic,
and the Ukrainian Soviet Socialist Republic were admitted. Poland was not present, but space on the Charter was reserved for
the signature of a representative of Poland. The U.S. government paid the expenses of the conference, which were less than
2 million dollars.