The US Overthrew Democratically Elected Salvador Allende in Chile in 1973
by John Lawrence
Besides that the US has interfered in other countries such as Iran. The ouster of Iranian Prime Minister Mohammed Mossadegh is the earliest coup of the Cold War that the U.S. government has acknowledged. In 1953, after nearly two years of Mossadegh’s premiership, during which time he challenged the authority of the Shah and nationalized an Iranian oil industry previously operated by British companies, he was forced from office and arrested, spending the rest of his life under house arrest.
Must I go on? OK, I will. Guatemala, 1954: President Jacobo Árbenz attempted a series of land reforms that threatened the holdings of the U.S.-owned United Fruit Company. A coup in 1954 forced Árbenz from power, allowing a succession of juntas in his place. Classified details of the CIA’s involvement in the ouster of the Guatemalan leader, which included equipping rebels and paramilitary troops while the U.S. Navy blockaded the Guatemalan coast, came to light in 1999.
Other US supported "meddling" in other countries resulting in overthrown leaders: Congo, 1960; Dominican Republic, 1961; Brazil, 1964; Chile 1973.
South Vietnam, 1963. “For the military coup d’etat against Ngo Dinh Diem, the U.S. must accept its full share of responsibility,” the Pentagon Papers state. “Beginning in August of 1963 we variously authorized, sanctioned and encouraged the coup efforts of the Vietnamese generals and offered full support for a successor government…. We maintained clandestine contact with them throughout the planning and execution of the coup and sought to review their operational plans and proposed new government.”