The United States government has been involved in the overthrow of foreign governments without the overt use of U.S. military force. Often such operations are tasked to the Central Intelligence Agency (CIA).
Many of the governments targeted by the US are democratically elected, rather than authoritarian governments or military dictatorships. In many cases the governments toppled are replaced by dictatorships.
A democratically elected government headed by President João Goulart is successfully overthrown by a CIA-supported coup in March 1964. On March 30, the American military attaché in Brazil, Colonel Vernon A. Walters, telegraphs the State Department. He confirms that Brazilian army generals, independently of the US, have committed themselves to acting against Goulart within a week of the meeting, but no date is set.
Declassified transcripts of communications show that, predicting an all-out civil war, US President Johnson authorizes logistical materials to be in place to support the coup-side of the rebellion as part of U.S. Operation Brother Sam.