Question: When was the last armed conflict that took place on American soil?

List of conflicts in the United States














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This is a list of conflicts in the United States. Conflicts are arranged chronologically from the late modern period to contemporary history. This list includes (but is not limited to) the following: Indian wars, skirmishes, wars of independence, liberation wars, colonial wars, undeclared wars, proxy wars, territorial disputes, and world wars. Also listed might be any battle that was itself only part of an operation of a campaign of a theater of a war. There may also be periods of violent civil unrest listed, such as: riots, shootouts, spree killings, massacres, terrorist attacks, and civil wars. The list might also contain episodes of: human sacrifice, mass suicide, genocides, and other related items that have occurred within the geographical area (including overseas territories) of what is today known as, the "United States of America".
Late modern period
18th century
1775–1783 American Revolutionary War
1775
Battles of Lexington and Concord
Siege of Boston
Battle of Ticonderoga
Battle of Bunker Hill
1776
Battle of Long Island
Battle of Harlem Heights
Battle of White Plains
Battle of Trenton
1777
Battle of Princeton
Battle of Oriskany
Battle of Bennington
Battle of Brandywine Creek
Battle of Saratoga
Capture of Philadelphia
Battle of Germantown
1778
Battle of Monmouth
Capture of Savannah
1779
Battle of Baton Rouge
Battle of Vincennes
1780
Siege of Charleston
Battle of Camden
Battle of King's Mountain
1781
Battle of Cowpens
Battle of Guilford Court House
Siege of Ninety Six
Siege of Yorktown
1777–1794 Cherokee–American wars
1783–1788 Second Pennamite War between settlers from Connecticut and Pennsylvania in Wyoming Valley of Pennsylvania
1785–1795 Northwest Indian War
1786–1787 Shays' Rebellion
1791–1794 Whiskey Rebellion
1798–1800 Quasi-War, an undeclared naval war with France
19th century
1804 Battle of Sitka Russian forces defeat the Tlingit in the last major armed conflict between Europeans and Alaska Natives.
1811 Tecumseh's War
1812–1815 War of 1812
1812
Siege of Fort of Mackinac
First Battle of Sackett's Harbor
Battle of Brownstown
Battle of Maguaga
Battle of Fort Dearborn
Siege of Detroit
Siege of Fort Harrison
Siege of Fort Wayne
Battle of the Mississinewa
1813
Battle of Frenchtown
Raid on Elizabethtown
Battle of Ogdensburg
Siege of Fort Meigs
Battle of Sackett's Harbor
Battle of Craney Island
Battle of Fort Stephenson
Battle of St. Michaels
Battle of Lake Erie
Capture of Fort Niagara
1814
Raid on Fort Oswego
Siege of Prairie du Chien
Battle of Big Sandy Creek
Battle of Mackinac Island
Battle of Bladensburg
Burning of Washington
Raid on Alexandria
Battle of Caulk's Field
Battle of North Point
Battle of Lake Champlain
Battle of Baltimore
Battle of Pensacola (1812)
1815
Battle of New Orleans
Battle of Fort Bowyer
1813–1814 Creek War
1817–1818 First Seminole War
1827 Winnebago War
1831 Nat Turner's Rebellion
1832 Black Hawk War
1835–1842 Second Seminole War
1835–1836 Toledo War (bloodless)
1835–1836 Texas Revolution
October 2, 1835 Battle of Gonzales
October 10, 1835 Battle of Goliad
November 4, 1835 Battle of Lipantitlán
October 28, 1835 Battle of Concepción
November 26, 1835 Grass Fight
October 12 – December 11, 1835 Siege of Béxar
February 27, 1836 Battle of San Patricio
March 2, 1836 Battle of Agua Dulce
February 23 – March 6, 1836 Battle of the Alamo
March 12–15, 1836 Battle of Refugio
March 19–20, 1836 Battle of Coleto
April 21, 1836 Battle of San Jacinto
1838 Missouri Mormon War
1838–1839 Aroostook War
1839 Honey War (bloodless)
1841–1842 Dorr War
1845 Milwaukee Bridge War
1846–1848 Mexican–American War
1846 Battle of Palo Alto
1846 Battle of Resaca de la Palma
1846 Occupation of Santa Fe
1846 Battle of Monterey
1846 Siege of Los Angeles
1846 Battle of San Pasqual
1846 Battle of Rio San Gabriel
1848–1855 Cayuse War
1854–1858 Bleeding Kansas
1855–1858 Third Seminole War
1857–1858 Utah War
1859 Pig War
1860 Pyramid Lake War
1861–1865 American Civil War
1861
Battle of Fort Sumter
Battle of Philippi
Battle of Big Bethel
First Battle of Bull Run
Battle of Balls Bluff
1862
Battle of Roanoke Island
Battle of Fort Donelson
Battle of Pea Ridge
Battle of Hampton Roads
Battle of Shiloh
Battle of Island Number 10
Battle of Fair Oaks
Battle of Memphis
Battle of Cross Keys
Battle of Port Republic
Seven Days' Battles
Battle of Baton Rouge
Battle of Cedar Mountain
Second Battle of Bull Run
Battle of Antietam
Battle of Fredericksburg
Battle of Stones River
1863
Battle of Chancellorsville
Siege of Vicksburg
Battle of Gettysburg
Battle of Chickamauga
Battle of Chattanooga
Battle of Knoxville
1864
Battle of Olustee
Battle of the Wilderness
Battle of Spotsylvania
Battle of North Anna
Battle of Cold Harbor
Siege of Petersburg
Battle of the Crater
Battle of Mobile Bay
Siege of Atlanta
Battle of Franklin II
Battle of Nashville
1865
Battle of Natural Bridge
Battle of Bentonville
Battle of Five Forks
Third Battle of Petersburg
Battle of Appomattox Court House
1862 Dakota War of 1862
1863–1865 Colorado War
1864 Sand Creek Massacre
1865–1866 Fenian Raids
1866–1868 Red Cloud's War
1867–1875 Comanche War
1872–1873 Modoc War
1876–1877 Black Hills War
1877 Nez Percé War
1878 Lincoln County War
1878–1900 Colorado Range War
1881 Gunfight at the O.K. Corral
1887-1894 Hatfield-McCoy Feud
1892 Homestead Strike
1882 Pleasant Valley War
1890–1891 Ghost Dance War
1889–1893 Johnson County War
1891-1892 Coal Creek War
1891–1893 Garza Revolution
1898 Spanish–American War
1898 Battle of Manila Bay
1898 Battle of Yauco
1898 Battle of Guayama
1898 Battle of Coamo
1899–1902 Philippine–American War
1899–1913 Moro Rebellion
Contemporary history
20th Century
This covers all conflicts and terrorist attacks in the 1900s that occurred within the modern territory of the United States of America. This also includes attacks upon the United States from Eurasian powers. 
1910–1919 Border War
April 20, 1914 Ludlow Massacre
1914–1918 World War I
April 21, 1914 Ypiranga incident
July 30, 1916 2:08:00 AM (AST; GMT−4) Black Tom explosion
January 11, 1917 Kingsland Explosion
August 2–3, 1917 Green Corn Rebellion
July 21, 1918 Attack on Orleans
August 7, 1918 Battle of Ambos Nogales
May 31 – June 1, 1921 Tulsa race riot
1912 – 1921 West Virginia coal wars
September 10–21, 1921 Battle of Blair Mountain
1939 – 1945 World War II

October 16, 1940 – May 21, 1941 Machita Incident
December 7, 1941 Attack on Pearl Harbor (Not in North America)
February 23, 1942 Bombardment of Ellwood
February 24–25, 1942 Battle of Los Angeles
June 3, 1942 – August 15, 1943 Battle of the Aleutian Islands
June 21, 1942 Bombardment of Fort Stevens
July 27, 1942 Lordsburg Killings
September 9–29, 1942 Lookout Air Raids
May 30, 1943 Zoot Suit Riots
August 14, 1944 Fort Lawton Riot
March 12, 1945 Santa Fe Riot
April 16, – September 17, 1945 Project Hula
July 8, 1945 Midnight Massacre
May 2–4, 1946 Battle of Alcatraz
August 1–3 Battle of Athens (1946)
August 11–17, 1965 Watts Rebellion
July 23–27, 1967 1967 Detroit riot
May 4, 1970 Kent State shootings
September 9, 1971 Attica Prison riot
May 13, 1985 MOVE Philadelphia bombing
April 29, 1992 Los Angeles riots
August 21–31, 1992 Ruby Ridge standoff
February 28 – April 19, 1993 Waco siege
April 19, 1995 Oklahoma City bombing
February 28, 1997 North Hollywood shootout
March 19 – 20, 1997 Heaven's Gate mass suicide
21st century
This includes all domestic conflicts and terrorist attacks that took place within the United States. Note that actions of terrorism and domestic conflict are distinguished from one another.
2001–present War on Terror
September 11, 2001 September 11 attacks
May 8, 2007 Fort Dix attack plot
November 5, 2009 Fort Hood shooting
April 15, 2013 Boston Marathon bombing
April 2, 2014 Fort Hood shooting
April 5, 2014 - May 2014 Bundy standoff
January 1-February 16, 2016 Occupation of the Malheur National Wildlife Refuge
See also
Indian Wars
Indian massacre
Second Happy Time
Attacks on US mainland
American Theater (World War II)
List of rampage killers: Americas
List of conflicts in British America
List of wars involving the United States
United States military casualties of war
List of incidents of civil unrest in the United States