Since 1945, the United States has been involved in numerous military conflicts and interventions. While it’s difficult to categorize these as “wars” in the traditional sense, here are some significant military actions and conflicts initiated by the U.S. since the end of World War II:

Major Wars and Large-Scale U.S. Military Involvements (Post–1945)

1. Korean War (1950–1953) – U.S. entered under UN auspices against North Korea (and later China).
2. Vietnam War (1955–1975) – escalation after 1964 Gulf of Tonkin incident.
3. Gulf War (1990–1991) – to drive Iraq out of Kuwait.
4. Afghanistan War (2001–2021) – in response to 9/11 attacks.
5. Iraq War (2003–2011) – U.S.-led invasion to oust Saddam Hussein.

Significant Smaller Conflicts, Interventions, or Military Actions

(often unilateral or without formal war declaration)

• Greek Civil War aid (1947–1949) – Truman Doctrine support
• Lebanon (1958 and 1982–1984) – U.S. Marines deployed
• Cuba (Bay of Pigs, 1961) – failed invasion
• Dominican Republic (1965) – U.S. troops intervened
• Cambodia and Laos (late 1960s–1970s) – during Vietnam War
• Grenada (1983) – U.S. invasion
• Panama (1989) – to remove Manuel Noriega
• Somalia (1992–1994) – humanitarian mission turned combat
• Bosnia (1995) – airstrikes under NATO
• Kosovo (1999) – NATO bombing campaign led by U.S.
• Libya (2011) – U.S.-NATO air operations
• Syria (2014–present, limited) – operations against ISIS
• Yemen and Pakistan (2000s–present) – drone strikes and operations against militant groups

Covert & Proxy Operations (CIA and others)

These don’t always count as “wars,” but they were significant:

• Iran (1953) – coup against Mossadegh
• Guatemala (1954) – CIA-backed overthrow
• Chile (1973) – covert support for Pinochet’s coup
• Nicaragua (1980s) – Contra support
• Various anti-communist and anti-insurgent operations in Africa, Latin America, and the Middle East

Total Count (Approximate)

If you include:

• Formal wars → about 5 main ones
• Direct armed interventions → about 20–25
• Covert or proxy conflicts → over 40 around the world since 1945

So broadly speaking, historians estimate that: 👉 The U.S. has initiated or been a principal actor in roughly 50–80 military conflicts of various scales since 1945.