What agreements about the United Nations were made at the Yalta Conference?

At the Yalta Conference in February 1945, the "Big Three" leaders—Franklin D. Roosevelt, Winston Churchill, and Joseph Stalin—made several key agreements to finalize the structure of the United Nations:

• Security Council Voting: The leaders worked out a compromise formula regarding the voting procedures for the Security Council, which helped resolve the "veto problem" that had persisted since the Dumbarton Oaks Conference.12
• Membership: The Soviet Union withdrew its initial demand that all 16 of its constituent republics be granted individual membership in the General Assembly. Instead, the leaders reached a tentative accord on a smaller number of Soviet republics to receive independent membership.12
• Trusteeship System: The leaders agreed that the new organization would incorporate a trusteeship system to replace the mandate system previously used by the League of Nations.2

These agreements, which modified the earlier Dumbarton Oaks proposals, provided the essential framework for the Charter of the United Nations that was subsequently negotiated and signed at the San Francisco Conference later that year.32