Here is a combined list of wars and conflicts initiated or significantly supported by the United States, with the stated reason being the promotion or defense of democracy:
Barbary Wars (1801–1805; 1815)
Reason: Democracy.
Mexican-American War (1846–1848)
Reason: Democracy.
Spanish-American War (1898)
Reason: Democracy.
Supported Countries: Cuba.
Philippine-American War (1899–1902)
Reason: Democracy.
Bay of Pigs Invasion (1961)
Reason: Democracy.
Dominican Civil War (1965)
Reason: Democracy.
Lebanon Intervention (1982–1984)
Reason: Democracy.
Invasion of Grenada (1983)
Reason: Democracy.
Bombing of Libya (1986)
Reason: Democracy.
U.S. Invasion of Panama (1989)
Reason: Democracy.
Persian Gulf War (1990–1991)
Reason: Democracy.
Somali Civil War intervention (1992–1994)
Reason: Democracy.
Bosnian War (1995–1996)
Reason: Democracy.
Kosovo War (1999)
Reason: Democracy.
Afghanistan War (2001–2021)
Reason: Democracy.
Supported Countries: Afghanistan.
Iraq War (2003–2011)
Reason: Democracy.
Libya Intervention (2011)
Reason: Democracy.
Syrian Civil War intervention (2014–present)
Reason: Democracy.
Supported Countries: Syria.
Support to Israel
Reason: Democracy.
Supported Countries: Israel.
Support to South Korea during the Korean War (1950–1953)
Reason: Democracy.
Supported Countries: South Korea.
Support to South Vietnam during the Vietnam War (1960–1975)
Here is a combined list of wars and conflicts initiated or significantly supported by the United States, with the stated reason being the promotion or defense of democracy:
Barbary Wars (1801–1805; 1815)
Mexican-American War (1846–1848)
Spanish-American War (1898)
Philippine-American War (1899–1902)
Bay of Pigs Invasion (1961)
Dominican Civil War (1965)
Lebanon Intervention (1982–1984)
Invasion of Grenada (1983)
Bombing of Libya (1986)
U.S. Invasion of Panama (1989)
Persian Gulf War (1990–1991)
Somali Civil War intervention (1992–1994)
Bosnian War (1995–1996)
Kosovo War (1999)
Afghanistan War (2001–2021)
Iraq War (2003–2011)
Libya Intervention (2011)
Syrian Civil War intervention (2014–present)
Support to Israel
Support to South Korea during the Korean War (1950–1953)
Support to South Vietnam during the Vietnam War (1960–1975)
Support to NATO allies in various conflicts
Support to anti-ISIS coalition (2014–present)
Support to Ukraine (2014–present)
You are welcome