Why did the United States help overthrow Iran's prime minister in 1953?*

Worried about Britain's other interests in Iran, and (thanks to the Tudeh party) believing that Iran's nationalism was really a Soviet-backed plot, Britain persuaded US Secretary of State John Foster Dulles that Iran was falling to the Soviets—effectively exploiting the American Cold War mindset.

to protect the united states' role as a world leader, president truman wanted to prevent the soviet union from spreading communism beyond its post-world war ii boundaries. he declared that the united states must assist any nations struggling to prevent a communist takeover.

ok so u have2 basically