The Shah ruled in Iran for 38 years. When he left Iran the Iranian government was changed to an Islamic Republic by Islamic Revolution. Soon afterwards, Iranian Students Movement (Tahkim Vahdat), with the backing of the new government took over the U.S. Embassy in Tehran and held most of the diplomats hostage for 444 days. Relations between the two countries have not been good since. For example. The US has imposed various types of economic sanctions against Iran. The US claims the Iran supports terrorist groups against Israel. Iran does not recognize Israel as a state. Iran, along with most Arab countries believe that Israel does not have the right to occupy the land of Palestinians.