For nearly five decades, America's role in the military coup that ousted Iran's elected prime minister and returned the shah to power has been lost to history, the subject of fierce debate in Iran and stony silence in the United States. One by one, participants have retired or died without revealing key details, and the Central Intelligence Agency said a number of records of the operation -- its first successful overthrow of a foreign government -- had been destroyed.
But a copy of the agency's secret history of the 1953 coup has surfaced, revealing the inner workings of a plot that set the stage for the Islamic revolution in 1979, and for a generation of anti-American hatred in one of the Middle East's most powerful countries.
The document, which remains classified, discloses the pivotal role British intelligence officials played in initiating and planning the coup, and it shows that Washington and London shared an interest in maintaining the West's control over Iranian oil.
The secret history, written by the C.I.A.'s chief coup planner and obtained by The New York Times, says the operation's success was mostly a matter of chance. The document shows that the agency had almost complete contempt for the man it was empowering, Shah Mohammed Reza Pahlevi, whom it derided as a vacillating coward. And it recounts, for the first time, the agency's tortured efforts to seduce and cajole the shah into taking part in his own coup.
The operation, code-named TP-Ajax, was the blueprint for a succession of C.I.A. plots to foment coups and destabilize governments during the cold war -- including the agency's successful coup in Guatemala in 1954 and the disastrous Cuban intervention known as the Bay of Pigs in 1961. In more than one instance, such operations led to the same kind of long-term animosity toward the United States that occurred in Iran.
The history says agency officers orchestrating the Iran coup worked directly with royalist Iranian military officers, handpicked the prime minister's replacement, sent a stream of envoys to bolster the shah's courage, directed a campaign of bombings by Iranians posing as members of the Communist Party, and planted articles and editorial cartoons in newspapers.
But on the night set for Prime Minister Mohammed Mossadegh's overthrow, almost nothing went according to the meticulously drawn plans, the secret history says. In fact, C.I.A. officials were poised to flee the country when several Iranian officers recruited by the agency, acting on their own, took command of a pro-shah demonstration in Tehran and seized the government.
Two days after the coup, the history discloses, agency officials funneled $5 million to Iran to help the government they had installed consolidate power.
The outlines of the American role in the coup were disclosed in Iran at the outset and later in the memoirs of C.I.A. officers and other published accounts. But many specifics have remained classified, and the secret history obtained by The New York Times is the first detailed government account of the coup to be made public.
The C.I.A. has been slow to make available the Iran files. Two directors of central intelligence, Robert Gates and R. James Woolsey, vowed to declassify records of the agency's early covert actions, including the coup. But the agency said three years ago that a number of relevant documents had been destroyed in the early 1960's.
A C.I.A. spokesman said Friday that the agency had retained about 1,000 pages of documents related to the coup, besides the history and an internal account written later. He said the papers destroyed in the early 1960's were duplicates and working files.