Final answer:
In 1979, the Iranian Revolution led to the overthrow of the US-backed shah of Iran and the rise of Ayatollah Khomeini as the new leader. The revolution also had significant implications for the country's economy, particularly in the oil industry.
Step-by-step explanation:
In 1979, Iranian history changed with the Iranian Revolution that took place in January. The revolution resulted in the ousting of the US-backed shah of Iran and the rise of Ayatollah Khomeini as the new leader. Khomeini sought to nationalize the oil industry in Iran, which affected the country's economy and led to increased oil prices globally.