On April 25th, 1945, the United Nations Founding Conference met in San Francisco. Secretary of State Stettinius headed the U.S. delegation. In order to avoid the problems Wilson encountered with the League of Nations, the US delegations included representatives from both major branches of Congress.
The only purpose of the San Francisco Conference was the establishment of a Charter for the new organization. The smaller powers at the conference attempted, unsuccessfully, to have the power of the "big five" limited.