What are the main causes and effects of the 1979 Iranian Revolution?

(preferable in SAQ format)

Iranian Revolution, also called Islamic Revolution, Persian Enqelāb-e Eslāmī, popular uprising in Iran in 1978–79 that resulted in the toppling of the monarchy on February 11, 1979, and led to the establishment of an Islamic republic.

These groups, which included clergy, landowners, intellectuals, and merchants, had previously come together in the Constitutional Revolution of 1905–11. Efforts toward satisfactory reform were continually stifled, however, amid reemerging social tensions as well as foreign intervention from Russia, the United Kingdom, and, later, the United States.

Explanation:

d. william mckinley's southern upbringing him win.