Tonight I decided to start counting the number of governments the U.S. has attempted to overthrow since WWII. This list is from the website of author William Blum. Spoiler alert: This list ends with the 2014 overthrow of the democratically elected government of Ukraine.
Instances of the United States overthrowing, or attempting to overthrow, a foreign government since the Second World War. (* indicates successful ouster of a government):
China 1949 to early 1960s
Albania 1949-53
East Germany 1950s
Iran 1953 *
Guatemala 1954 *
Costa Rica mid-1950s
Syria 1956-7
Egypt 1957
Indonesia 1957-8
British Guiana 1953-64 *
Iraq 1963 *
North Vietnam 1945-73
Cambodia 1955-70 *
Laos 1958 *, 1959 *, 1960 *
Ecuador 1960-63 *
Congo 1960 *
France 1965
Brazil 1962-64 *
Dominican Republic 1963 *
Cuba 1959 to present
Bolivia 1964 *
Indonesia 1965 *
Ghana 1966 *
Chile 1964-73 *
Greece 1967 *
Costa Rica 1970-71
Bolivia 1971 *
Australia 1973-75 *
Angola 1975, 1980s
Zaire 1975
Portugal 1974-76 *
Jamaica 1976-80 *
Seychelles 1979-81
Chad 1981-82 *
Grenada 1983 *
South Yemen 1982-84
Suriname 1982-84
Fiji 1987 *
Libya 1980s
Nicaragua 1981-90 *
Panama 1989 *
Bulgaria 1990 *
Albania 1991 *
Iraq 1991
Afghanistan 1980s *
Somalia 1993
Yugoslavia 1999-2000 *
Ecuador 2000 *
Afghanistan 2001 *
Venezuela 2002 *
Iraq 2003 *
Haiti 2004 *
Somalia 2007 to present
Honduras 2009 *
Libya 2011 *
Syria 2012
Ukraine 2014 *
For more details, check out the Wikipedia page, “United States involvement in regime change.“