Using Michael Hunt's book "Crises in U.S. Foreign Policy" as a referral, this paper explains in detail why the U.S. involved itself in Iran's politics and what they hoped to achieve by involving themselves. The paper explains the rise of a highly powerful Iran that neglected its people and that would eventually fall, which completely undermined what the U.S. had thought they had accomplished.
From the Paper:
"Until the revolution of 1979, the United States saw Iran as the pivotal country for maintaining stability in a precarious Middle East. Iran provided a secure source of oil for the U.S. and its western European allies, as well as a way for the U.S. to contain the Soviet Union throughout the region. The U.S.'s plan to forcefully create a westernized state by use of an oppressive regime backfired with the Iranian Revolution of 1979. In effect, the U.S.'s efforts to establish direct political control in the Middle East resulted in the exact opposite of what it was hoping to achieve."