In Iran the crisis Hostile_encounter strengthened Cause_change_of_strength the prestige of Ayatollah Ruhollah Khomeini and the political power of theocrats who opposed Agree_or_refuse_to_act any normalization of relations with the West .

Ayatollah Khomeini was invited Request back to Iran by the government , and returned Arriving to Tehran to a greeting by several million Iranians .

The royal reign collapsed Catastrophe shortly after on 11 February when guerrillas and rebel troops overwhelmed Destroying troops loyal to the Shah in armed street fighting , bringing Khomeini to official power .

Iran voted Choosing by national referendum to become Becoming an Islamic republic on 1 April 1979 and to formulate and approve Agree_or_refuse_to_act a new theocratic-republican constitution whereby Khomeini became Becoming Supreme Leader of the country in December 1979 .