Key facts about Iran
Known as Persia until 1935, Iran became an Islamic republic in 1979 after the ruling monarchy was overthrown and the shah was forced into exile. Conservative clerical forces established a theocratic system of government with ultimate political authority nominally vested in a learned religious scholar.
Iran-US relations have been strained since a group of Iranian students seized the US Embassy in Tehran on November 4, 1979, and held it until January 20, 1981. During 1980-88, Iran fought a bloody, indecisive war with Iraq that eventually expanded into the Gulf and led to clashes between the US Navy and Iranian military forces between 1987-1988.
Source: CIA.gov
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