decades. During World War II Iran stayed neutral but in 1941 the Allies (the USSR and Great Britain) invaded Iran and replaced Iran's Shah Reza Pahlavi (who was perceived as being pro-German) with his son Mohammad Reza Pahlavi to protect their access to Iranian oil, and to secure routes to ship western military aid to the Soviet Union. Iran's parliamentary government led by Prime Minister Mohammed Mosaddeq was toppled in a 1953 coup d'état by royalist forces supported and funded by CIA and MI6 after Mohammed Mosaddeq nationalized Iranian oil. Shah Mohammad Reza Pahlavi became the preeminent leader in Iran, and instated Fazlollah Zahedi from the military as the new Prime Minister. United States has considered the Shah as a close ally and Iran as its main base in the Middle East. The Shah also tried to modernize Iran's economy and westernize Iran's culture. These and other policies contributed to alienating nationalists, leftists, and religious groups. The monarchy was overthrown in 1979 by the Iranian Revolution. In the same year a referendum was held by Ruhollah Khomeini, that asked whether there should be an 'Islamic Republic' or not. The 1979 referendum (in favor of an Islamic Republic) got 98% support of those who voted. The constitution was modeled on the 1958 constitution of the French Fifth Republic by the Assembly of Experts for Constitution (who were elected by direct popular vote) and Khomeini made himself the new Supreme Leader of Iran. The constitution received above 99% support in another 1979 referendum. After Khomeini's death, the Assembly of Experts (which is made of Islamic scholars elected by direct vote) appointed Ali Khamenei as the new Supreme Leader. The constitution was also amended through a referendum in 1989 with 97% support a few months before Ayatollah Ruhollah Khomeini died increasing the powers of Supreme Leader. Iran holds regular national elections by universal suffrage for all citizens (regardless of race, religion, or sex, who are of voting age) for electing the President, members of Parliament, Assembly of Experts, City and Village Councils where political parties support candidates. Issues with the current political system The current political system in Iran was designed to allow Iranians to decide their future by themselves without being oppressed by authorities, but in practice only allows a limited democracy. One of the main problems of Iran's system is the consolidation of too much power in the hands of the