In 1953, the UK and US collaborated to overthrow the democratically elected government of Iran in favor of strengthening the power of the Shah over the country. Prime Minister Mohammad Mosaddegh was unpopular with the Brits after he attempted to nationalize the country's oil interests, which were being exploited by the Anglo-Iranian Oil Company. After convincing the Eisenhower administration that Mosaddegh's government would pull Iran into the Soviet sphere of influence, the CIA and MI6 helped plan and execute the coup by the royalists. Several hundred people were killed in the riots; Mosaddegh was convicted of treason and held in house arrest for the rest of his life; many of his supporters were jailed or killed.
The continuing bombing/killing of civilians in the middle east by Americans further highlights to me that the United States will never be able to overcome the violence it has inflicted on the world by continuing to inflict more violence.