United Nations Security Council
Along with the five permanent members, the Security Council of the United Nations has temporary members that hold their seats on a rotating basis by geographic region. Non-permanent members may be involved in global security briefings. In its first two decades, the Security Council had six non-permanent members, the first of which were Australia, Brazil, Egypt, Mexico, the Netherlands, and Poland. In 1965, the number of non-permanent members was expanded to ten.
Aftermath of World War II
The five major Allied powers were given permanent membership in the United Nations Security Council. The permanent members can veto any United Nations Security Council resolution, the only UN decisions that are binding according to international law. The five powers at the time of founding were: the United States of America, the United Kingdom, France, the Soviet Union and the Republic of China. The Republic of China lost the Chinese Civil War and retreated to the island of Taiwan by 1950 but continued to be a permanent member of the Council even though the "de facto" state in control of mainland China was the People's Republic of China (PRC). This was changed in 1971 when the PRC was given the permanent membership previously held by the Republic of China. Russia inherited the permanent membership of the Soviet Union in 1991 after the dissolution of that state.