Re: Don't understand.
1953: US and British intelligence agencies orchestrate a coup to oust Iran's democratically elected Prime Minister, Mohammad Mossadeq. What follows is a bloody dictatorship by the - US backed - Shah.
1979: Iranian revolution
The US-backed Shah of Iran, Mohammed Reza Pahlevi, is forced to leave the country. Two weeks later, Islamic religious leader Ayatollah Khomeini returns from exile. Following a referendum, the Islamic Republic of Iran is proclaimed on 1 April. Yes, no pun there.
Since then, whenever a moderate politician comes to power and tries to do something for the people, the USA and/or Israel intervene (killing someone, bombing some place, etc.). Result: The radical "Death to America!" religious goons get back to power, just as desired.