From Wikipedia

Secret Wars Of The CIA

The United States government has been involved in and assisted in overthrowing many foreign governments without the use of overt military force, primarily through the Central Intelligence Agency.

According to a variety of sources, the United States of America government has forcibly overthrown, and attempted to overthrow, foreign governments perceived as hostile, and replaced them with new ones, actions that have become known as regime change. Many of the governments targeted by the US have been democratically-elected, thus the target regimes are not necessarily authoritarian governments or military dictatorships, but in some cases are replaced by such dictatorships. In other cases dictatorships have been replaced by democracies.

Regime change has been attempted through direct involvement of US operatives, the funding and training of insurgency groups within these countries, anti-regime propaganda campaigns, coup d'états, and other, often illegal, activities usually conducted as operations by the Central Intelligence Agency (CIA). The US has also accomplished regime change by direct military action (see List of United States military history events) instead of by covert means.