Operation Uphold Democracy: Haiti, 1994-95.
Lebanese Civil War: Lebanon, 1982-1984.
Cold War: Everywhere, 1947-1991.
Boxer Rebellion: China, 1899-1900.
Chilean Civil War: Chile, 1891.
Sheepeater Indian War: North America (present day Idaho), 1879.
War On Terror: Everywhere, 2001-present.
Puget Sound War: North American nations of the Nisqually, Muckleshoot, Puyallup, Klickitat, Haida and Tlingit, 1855-1856.
Second Liberian Civil War: Liberia, 2003.
Philippine Insurrection: Philippines, 1899-1902.
Occupation of Nicaragua: Nicaragua, 1912-1933.
Occupation of Haiti: Haiti, 1915-1934.
Great Sioux War: North America, present day Montana, North Dakota, South Dakota and Wyoming, 1876-1877.
Moro Rebellion: Sultanate of Sulu, 1899-1913.
Occupation of the Dominican Republic: Dominican Republic, 1916-1924.
Mexican Revolution: Mexico, 1914-1919.
World War I: Everywhere, 1917-1918.
Russian Civil War: Russia, 1918-1920.
World War II: Everywhere, 1941-1945.
Quasi War: Atlantic Ocean, Caribbean, Indian Ocean, Mediterranean Sea, 1798-1800.
Persian Gulf War, 1991.
Red River War: North American Great Plains, 1874-1875.
Operation Blue Bat: Lebanon, 1958.
Vietnam War: Vietnam, 1953-1975.
War Between the States/War of Northern Aggression ("Civil War"): America, 1861-1865.
Korean War: Korea, 1950-1953.
Second Samoan Civil War: Samoa, 1898-1899.
First Sumatran Expedition: Chiefdom of Kuala Batee, 1832.
Tecumseh's War: North American Great Lakes, 1811.
Ghost War Dance: North America, present day South Dakota, 1890-1891.
Spanish-American War: Cuba, Philippines, Puerto Rico, Guam, etc., 1898.
Second Sumatran Expedition: Chiefdom of Quallah Battoo, 1838-1839.
Lava Beds War: Northern California, 1872-1873.
Korean Expedition: Korea, 1871.
Revolutionary War: United States, Canada, Great Britain, Atlantic Ocean, Caribbean, etc., 1774-1783.
Winnebago War: North America, present day Illinois and Michigan, 1827.
Battle of Kororareka: Māori Kororareka, New Zealand, 1845.
War of 1812: United States, Canada, indigenous North America, Gulf of Mexico, Atlantic Ocean, Caribbean, etc., 1812-1815.
Little Turtle's War: Indigenous North America, Canada, 1785-1795.
First Barbary War: North Africa, Mediterranean Sea, 1801-1805.
Second Barbary War: North Africa, Mediterranean Sea, 1815.
Aegean War On Pirates: Aegean Sea, 1825-1828.
Years are of American military involvement.
[Photo by Getty Images.]