What event launched the Islamic Revolution in Iran?

Enqelāb-e Iran; also known as the Islamic Revolution or the 1979 Revolution) refers to events involving the overthrow of the Pahlavi dynastyunder Mohammad Reza Shah Pahlavi, who was supported by the United States,[9] and eventual replacement of 2,500 years of continuous Persian monarchywith an Islamic Republic under the Grand AyatollahRuhollah Khomeini, the leader of the revolution, supported by a wide range of people including various Islamist and leftist organizations[10] and student movements.