The United Nations Trusteeship Council () is one of the six principal organs of the United Nations, established to help ensure that trust territories were administered in the best interests of their inhabitants and of international peace and security. The trust territories—most of them former mandates of the League of Nations or territories taken from nations defeated at the end of World War II—have all now attained self-government or independence, either as separate nations or by joining neighbouring independent countries. The last was Palau, formerly part of the Trust Territory of the Pacific Islands, which became a member state of the United Nations in December 1994. History Provisions to form a new UN agency to oversee the decolonization of dependent territories from colonial times were made at the San Francisco Conference in 1945 and were specified Chapter 12 of the Charter of the United Nations. Those dependent territories (colonies and mandated territories) were to be placed under the international trusteeship system created by the United Nations Charter as a successor to the League of Nations mandate system. Ultimately, eleven territories were placed under trusteeship: seven in Africa and four in Oceania. Ten of the trust territories had previously been League of Nations mandates; the eleventh was Italian Somaliland. In order to implement the provisions on the trusteeship system, the General Assembly passed resolution 64 on Dec. 14, 1946, which provided for the establishing of the United Nations Trusteeship Council. The Trusteeship Council held its first session in March 1947. In March 1948, the United States proposed that the territory of Mandatory Palestine be placed under UN Trusteeship with the termination of the British Mandate in May 1948 (see American trusteeship proposal for Palestine). However, the US did not make an effort to implement this proposal, which became moot with the declaration of the State of Israel. Under the Charter, the Trusteeship Council was to consist of an equal number of United Nations Member States administering trust territories and non-administering states. Thus, the Council was to consist of (1) all U.N. members administering trust territories, (2) the five permanent members of the Security Council, and (3) as many other non-administering members as needed to equalize the number of administering and non-administering members, elected by the United Nations General Assembly for renewable three-year terms. Over time, as trust territories attained independence, the size and workload of the Trusteeship Council was reduced. Ultimately,