On Sept, 11, 1973, the US helped overthrew a democratically elected government in Chile.
From Wikipedia……. On September 11, 1973, less than two months after the first failed coup attempt (Tanquetazo), and less than a month after the Chamber of Deputies, where the Opposition held a majority, condemned Allende’s alleged breaches of the constitution, the Chilean military overthrew president Salvador Allende, who died during the coup. US intervention in Chilean politics and support to opponents of Allende, including support for an assassination, has been documented by the declassification in 1998 of documents concerning the Project FUBELT operations, although its exact nature is still controversial. General Augusto Pinochet took over and established an anti-communist military dictatorship which lasted until 1990.
More on Wkipedia