This is a timeline of United States military operations. The list through 1975 is based on Committee on International Relations (now known as the Committee on Foreign Affairs). Dates show the years in which U.S. military units participated. The bolded items are the U.S. wars most often considered to be major conflicts by historians and the general public. Note that instances where the U.S. gave aid alone, with no military personnel involvement, are excluded, as are CIA-based operations.

 

Extraterritorial and major domestic deployments

Portions of this list are from the Congressional Research Service report

*** 1775-1800

1775-1783 - American Revolutionary War

1776-1777 - Second Cherokee War

1776-1794 - Chickamauga wars

1785-1795 - Northwest Indian War

1786-1787 - Shays' Rebellion

1794 - Whiskey Rebellion

1798-1800 - Quasi-War, an undeclared naval war with France. This contest included land actions, such as that in the Dominican Republic city of Puerto Plata, where U.S. Marines captured a French privateer under the guns of the forts. Congress authorized military action through a series of statutes.

1799-1800 - Fries's Rebellion, a Pennsylvania protest against war taxes.

*** 1800-1809

1801-1805 - First Barbary War - USS George Washington and USS Philadelphia affairs result in actions against the Barbary.

1806 – Spanish Mexico - A platoon under Captain Zebulon Pike invaded Spanish territory at the headwaters of the Rio Grande on orders from General James Wilkinson. He was made prisoner without resistance at a fort he constructed in present-day Colorado, taken to Mexico, and later released after seizure of his papers.

1806-10 – Gulf of Mexico. American gunboats operated from New Orleans against Spanish and French privateers off the Mississippi Delta, chiefly under Captain John Shaw and Master Commandant David Porter.

*** 1810-1819

1810 – West Florida (Spanish territory). Governor William C.C. Claiborne of Louisiana, on orders of President James Madison, occupied with troops territory in dispute east of the Mississippi as far as the Pearl River, later the eastern boundary of Louisiana. He was authorized to seize as far east as the Perdido River.

1812 – Amelia Island and other parts of east Florida, then under Spain. Temporary possession was authorized by President James Madison and by Congress, to prevent occupation by any other power; but possession was obtained by General George Mathews in so irregular a manner that his measures were disavowed by the President.

1812-15 – War of 1812. On June 18, 1812, the United States declared war against the United Kingdom. Among the issues leading to the war were British impressment of American sailors into the Royal Navy, interception of neutral ships and blockades of the United States during British hostilities with France.

1813 – West Florida (Spanish territory). On authority given by Congress, General Wilkinson seized Mobile Bay in April with 600 soldiers. A small Spanish garrison gave way. Thus U.S. troops advanced into disputed territory to the Perdido River, as projected in 1810. No fighting.

1813-14 – Marquesas Islands (French Polynesia). U.S. forces built a fort on the island of Nuku Hiva to protect three prize ships which had been captured from the British.

1814 – Spanish Florida. General Andrew Jackson took Pensacola and drove out the British forces.

1814-25 – Caribbean. Engagements between pirates and American ships or squadrons took place repeatedly especially ashore and offshore about Cuba, Puerto Rico, Santo Domingo, and Yucatan. Three thousand pirate attacks on merchantmen were reported between 1815 and 1823. In 1822, Commodore James Biddle employed a squadron of two frigates, four sloops of war, two brigs, four schooners, and two gunboats in the West Indies.

1815 – Algiers. The Second Barbary War was declared against the United States by the Dey of Algiers of the Barbary states, an act not reciprocated by the United States. Congress did authorize a military expedition by statute. A large fleet under Captain Stephen Decatur attacked Algiers and obtained indemnities.

1815 – Tripoli. After securing an agreement from Algiers, Captain Decatur demonstrated with his squadron at Tunis and Tripoli, where he secured indemnities for offenses during the War of 1812.

1816 – Spanish Florida. United States forces destroyed Negro Fort, which harbored fugitive slaves making raids into United States territory.

1816-18 – Spanish Florida - First Seminole War. The Seminole Indians, whose area was a haven for escaped slaves and border ruffians, were attacked by troops under General Jackson and General Edmund P. Gaines and pursued into northern Florida. Spanish posts were attacked and occupied, British citizens executed. In 1819 the Floridas were ceded to the United States.

1817 – Amelia Island (Spanish territory off Florida). Under orders of President James Monroe, United States forces landed and expelled a group of smugglers, adventurers, and freebooters.

1818 – Oregon. The USS Ontario dispatched from Washington, which made a landing at the mouth of the Columbia River to assert US claims. Britain had conceded sovereignty but Russia and Spain asserted claims to the area. Subsequently, American and British claims to the Oregon Country were resolved with the Oregon Treaty of 1846.

*** 1820-1829

1820-23 – Africa. Naval units raided the slave traffic pursuant to the 1819 act of Congress.

1822 – Cuba. United States naval forces suppressing piracy landed on the northwest coast of Cuba and burned a pirate station.

1823 – Cuba. Brief landings in pursuit of pirates occurred April 8 near Escondido; April 16 near Cayo Blanco; July 11 at Siquapa Bay; July 21 at Cape Cruz; and October 23 at Camrioca.

1824 – Cuba. In October the USS Porpoise landed bluejackets near Matanzas in pursuit of pirates. This was during the cruise authorized in 1822.

1824 – Puerto Rico (Spanish territory). Commodore David Porter with a landing party attacked the town of Fajardo which had sheltered pirates and insulted American naval officers. He landed with 200 men in November and forced an apology. Commodore Porter was later court-martialed for overstepping his powers.

1825 – Cuba. In March cooperating American and British forces landed at Sagua La Grande to capture pirates.

1827 – Greece. In October and November landing parties hunted pirates on the Mediterranean islands of Argenteire, Myconos, and Andros.

*** 1830-1839

1831-32 – Falkland Islands. Captain Silas Duncan of the USS Lexington investigated the capture of three American sailing vessels and sought to protect American interests.

1832 – Attack on Quallah Battoo, Sumatra, Indonesia - February 6–9. U.S. forces under Commodore John Downes aboard the frigate USS Potomac landed and stormed a fort to punish natives of the town of Quallah Battoo for plundering the American cargo ship Friendship.

1833 – Argentina. October 31 to November 15. A force was sent ashore at Buenos Aires to protect the interests of the United States and other countries during an insurrection.

1835-36 – Peru. December 10, 1835, to January 24, 1836, and August 31 to December 7, 1836. Marines protected American interests in Callao and Lima during an attempted revolution.

1835-1842 Florida Territory. United States Navy supports the Army's efforts at quelling uprisings and attacks on civilians by Seminole Indians. Government's efforts to relocate the Seminoles to west of the Mississippi are hindered by 7 years of war.

1836 – Mexico. General James Gaines occupied Nacogdoches, Texas, disputed territory, from July to December during the Texas Revolution, under orders to cross the "imaginary boundary line" if an Indian outbreak threatened.

1838 – The Caroline affair on Navy Island, Canada. After the failure of the Upper Canada Rebellion of 1837 favoring Canadian democracy and independence from the British Empire; William Lyon Mackenzie and his rebels fled to Navy Island where they declared the Republic of Canada. American sympathizers sent supplies on the SS Caroline, which was intercepted by the British and set ablaze, after killing one American. It was falsely reported that dozens of Americans were killed as they were trapped on board, and American forces retaliated by burning a British steamer while it was in U.S. waters.

1838-39 – Sumatra (Indonesia). December 24, 1838, to January 4, 1839. A naval force landed to punish natives of the towns of Quallah Battoo and Muckie (Mukki) for depredations on American shipping.

*** 1840-1849

1840 – Fiji Islands. July. Naval forces landed to punish natives for attacking American exploring and surveying parties.

1841 – McKean Island (Drummond Island/Taputenea), Gilbert Islands (Kingsmill Group), Pacific Ocean. A naval party landed to avenge the murder of a seaman by the natives.

1841 – Samoa. February 24. A naval party landed and burned towns after the murder of an American seaman on Upolu.

1842 – Mexico. Commodore Thomas ap Catesby Jones, in command of a squadron long cruising off California, occupied Monterey, California, on October 19, believing war had come. He discovered peace, withdrew, and saluted. A similar incident occurred a week later at San Diego.

1843 – China. Sailors and marines from the St. Louis were landed after a clash between Americans and Chinese at the trading post in Canton.

1843 – Africa. November 29 to December 16. Four United States vessels demonstrated and landed various parties (one of 200 marines and sailors) to discourage piracy and the slave trade along the Ivory Coast, and to punish attacks by the natives on American seamen and shipping.

1844 – Mexico. President Tyler deployed U.S. forces to protect Texas against Mexico, pending Senate approval of a treaty of annexation. (Later rejected.) He defended his action against a Senate resolution of inquiry.

1846-48 – Mexican-American War On May 13, 1846, the United States recognized the existence of a state of war with Mexico. After the annexation of Texas in 1845, the United States and Mexico failed to resolve a boundary dispute and President Polk said that it was necessary to deploy forces in Mexico to meet a threatened invasion.

The war ended with the 'Treaty of Guadalupe Hidalgo, signed on February 2, 1848. The 'Treaty' gave the U.S. undisputed control of Texas, established the U.S.-Mexican border of the Rio Grande River, and ceded to the United States the present-day states of California, Nevada, Utah, and parts of Colorado, Arizona, New Mexico, and Wyoming. In return, Mexico received US $18,250,000 ($459,127,885 today)—less than half the amount the U.S. had attempted to offer Mexico for the land before the opening of hostilities.

1849 – Smyrna (Izmir, Turkey). In July a naval force gained release of an American seized by Austrian officials.

*** 1850-1859

1851 – Ottoman Empire. After a massacre of foreigners (including Americans) at Jaffa in January, a demonstration by the Mediterranean Squadron was ordered along the Turkish (Levant) coast.

1851 – Johanns Island (east of Africa). August. Forces from the U.S. sloop-of-war Dale exacted redress for the unlawful imprisonment of the captain of an American whaling brig.

1852-53 – Argentina. February 3 to 12, 1852; September 17, 1852 to April 1853. Marines were landed and maintained in Buenos Aires to protect American interests during a revolution.

1853 – Nicaragua. March 11 to 13. US forces landed to protect American lives and interests during political disturbances

1853-54 – Japan. Commodore Matthew Perry and his expedition made a display of force leading to the "opening of Japan."

1853-54 – Ryūkyū and Bonin Islands (Japan). Commodore Matthew Perry on three visits before going to Japan and while waiting for a reply from Japan made a naval demonstration, landing marines twice, and secured a coaling concession from the ruler of Naha on Okinawa; he also demonstrated in the Bonin Islands with the purpose of securing facilities for commerce.

1854 – China. April 4 to June 15 to 17. American and English ships landed forces to protect American interests in and near Shanghai during Chinese civil strife.

1854 – Nicaragua. July 9 to 15. Naval forces bombarded and burned San Juan del Norte (Greytown) to avenge an insult to the American Minister to Nicaragua.

1855 – China. May 19 to 21. U.S. forces protected American interests in Shanghai and, from August 3 to 5 fought pirates near Hong Kong.

1855 – Fiji Islands. September 12 to November 4. An American naval force landed to seek reparations for attacks on American residents and seamen.

1855 – Uruguay. November 25 to 29. United States and European naval forces landed to protect American interests during an attempted revolution in Montevideo.

1856 – Panama, Republic of New Grenada. September 19 to 22. U.S. forces landed to protect American interests during an insurrection.

1856 – China. October 22 to December 6. U.S. forces landed to protect American interests at Canton during hostilities between the British and the Chinese, and to avenge an assault upon an unarmed boat displaying the United States flag.

1857-58 – Utah War. The Utah War was a dispute between Mormon settlers in Utah Territory and the United States federal government. The Mormons and Washington each sought control over the government of the territory, with the national government victorious. The confrontation between the Mormon militia and the U.S. Army involved some destruction of property, but no actual battles between the contending military forces.

1857 – Nicaragua. April to May, November to December. In May Commander Charles Henry Davis of the United States Navy, with some marines, received the surrender of William Walker, self-proclaimed president of Nicaragua, who was losing control of the country to forces financed by his former business partner, Cornelius Vanderbilt, and protected his men from the retaliation of native allies who had been fighting Walker. In November and December of the same year United States vessels USS Saratoga, USS Wabash, and Fulton opposed another attempt of William Walker on Nicaragua. Commodore Hiram Paulding's act of landing marines and compelling the removal of Walker to the United States, was tacitly disavowed by Secretary of State Lewis Cass, and Paulding was forced into retirement.

1858 – Uruguay. January 2 to 27. Forces from two United States warships landed to protect American property during a revolution in Montevideo.

1858 – Fiji Islands. October 6 to 16. A marine expedition with the USS Vandalia enacted revenge on natives for the murder of two American citizens at Waya.

1858-59 – Ottoman Empire. The Secretary of State requested a display of naval force along the Levant after a massacre of Americans at Jaffa and mistreatment elsewhere "to remind the authorities (of the Ottoman Empire) of the power of the United States."

1859 – Paraguay. Congress authorized a naval squadron to seek redress for an attack on a naval vessel in the Parana River during 1855. Apologies were made after a large display of force.

1859 – Mexico. Two hundred United States soldiers crossed the Rio Grande in pursuit of the Mexican nationalist Juan Cortina.

1859 – China. July 31 to August 2. A naval force landed to protect American interests in Shanghai.

*** 1860-1869

1860 – Angola, Portuguese West Africa. March 1. American residents at Kissembo called upon American and British ships to protect lives and property during problems with natives.

1860 – Colombia, Bay of Panama. September 27 to October 8. Naval forces landed to protect American interests during a revolution.

1861-1865 – American Civil War A major war between the United States (the Union) and eleven Southern states which declared that they had a right to secession and formed the Confederate States of America.

1863 – Japan. July 16. Naval battle of Shimonoseki. The USS Wyoming retaliated against a firing on the American vessel Pembroke at Shimonoseki.

1864 – Japan. July 14 to August 3. Naval forces protected the United States Minister to Japan when he visited Yedo to negotiate concerning some American claims against Japan, and to make his negotiations easier by impressing the Japanese with American power.

1864 – Japan. September 4 to 14. Naval forces of the United States, Great Britain, France, and the Netherlands compelled Japan and the Prince of Nagato in particular to permit the Straits of Shimonoseki to be used by foreign shipping in accordance with treaties already signed.

1865 – Panama. March 9 and 10. US forces protected the lives and property of American residents during a revolution.

1865-1877 Southern United States – Reconstruction following the American Civil War. The South is divided into five Union occupation districts under the Reconstruction Act.

1866 – Mexico. To protect American residents, General Sedgwick and 100 men in November obtained surrender of Matamoros, on the border State of Tamaulipas. After three days he was ordered by US Government to withdraw. His act was repudiated by the President.

1866 – China. June 20 to July 7. US forces punished an assault on the American consul at Newchwang.

1867 – Nicaragua. Marines occupied Managua and Leon.

1867 – Formosa (island of Taiwan) June 13. A naval force landed and burned a number of huts to punish the murder of the crew of a wrecked American vessel.

1868 – Japan (Osaka, Hiolo, Nagasaki, Yokohama, and Negata). - February 4 to 8, April 4 to May 12, June 12 and 13. US forces were landed to protect American interests during the civil war in Japan.

1868 – Uruguay. February 7 and 8, 19 to 26. US forces protected foreign residents and the customhouse during an insurrection at Montevideo.

1868 – Colombia. April. US forces protected passengers and treasure in transit at Aspinwall during the absence of local police or troops on the occasion of the death of the President of Colombia.

*** 1870-1879

1870 – Mexico. June 17 and 18. US forces destroyed the pirate ship Forward, which had been run aground about 40 miles up the Rio Tecapan.

1870 – Kingdom of Hawaii. September 21. US forces placed the American flag at half-mast upon the death of Queen Kalama, when the American consul at Honolulu would not assume responsibility for so doing.

1871 – Korea. Shinmiyangyo. June 10 to 12. A US naval force attacked and captured five forts to punish natives for depredations on Americans, particularly for murdering the crew of the General Sherman and burning the schooner, and for later firing on other American small boats taking soundings up the Salee River.

1873 – Colombia (Bay of Panama). May 7 to 22, September 23 to October 9. U.S. forces protected American interests during hostilities between local groups over control of the government of the State of Panama.

1873-96 – Mexico. United States troops crossed the Mexican border repeatedly in pursuit of cattle and other thieves and other brigands.

1874 – Kingdom of Hawaii. February 12 to 20. Detachments from American vessels were landed to protect the interests of Americans living in the Kingdom during the coronation of a new king.

1876 – Mexico. May 18. An American force was landed to police the town of Matamoros, Tamaulipas State, temporarily while it was without other government.

*** 1880-1889

1882 – Egypt. July 14 to 18. American forces landed to protect American interests during warfare between British and Egyptians and looting of the city of Alexandria by Arabs.

1885 – Panama (Colon). January 18 and 19. US forces were used to guard the valuables in transit over the Panama Railroad, and the safes and vaults of the company during revolutionary activity. In March, April, and May in the cities of Colon and Panama, the forces helped reestablish freedom of transit during revolutionary activity.

1888 – Korea. June. A naval force was sent ashore to protect American residents in Seoul during unsettled political conditions, when an outbreak of the populace was expected.

1888 – Haiti. December 20. A display of force persuaded the Haitian Government to give up an American steamer which had been seized on the charge of breach of blockade.

1888-89 – Samoa. November 14, 1888, to March 20, 1889. US forces were landed to protect American citizens and the consulate during a native civil war.

1889 – Kingdom of Hawaii. July 30 and 31. US forces at Honolulu protected the interests of Americans living in Hawaii during an American led revolution.

*** 1890-1899

1890 – Argentina. A naval party landed to protect US consulate and legation in Buenos Aires.

1890 – South Dakota. December 29. Soldiers of the US Army 7th Cavalry killed 178 Sioux Amerindians following an incident over a disarmament-inspection at a Lakota Sioux encampment near Wounded Knee Creek. 89 other Amerinds were injured, 150 were reported missing; Army casualties were 25 killed, 39 wounded.

1891 – Haiti. US forces sought to protect American lives and property on Navassa Island.

1891 – Bering Strait. July 2 to October 5. Naval forces sought to stop seal poaching.

1891 – Chile. August 28 to 30. US forces protected the American consulate and the women and children who had taken refuge in it during a revolution in Valparaiso.

1893 – overthrow of the Hawaiian Kingdom. January 16 to April 1. Marines landed in Hawaii, ostensibly to protect American lives and property, but many believed actually to promote a provisional government under Sanford B. Dole. This action was disavowed by President Cleveland, and eventually the United States apologized in 1993.

1894 – Brazil. January. A display of naval force sought to protect American commerce and shipping at Rio de Janeiro during a Brazilian civil war.

1894 – Nicaragua. July 6 to August 7. US forces sought to protect American interests at Bluefields following a revolution.

1894-95 – China. Marines were stationed at Tientsin and penetrated to Peking for protection purposes during the First Sino-Japanese War.

1894-95 – China. A naval vessel was beached and used as a fort at Newchwang for protection of American nationals.

1894-96 – Korea. July 24, 1894 to April 3, 1896. A guard of marines was sent to protect the American legation and American lives and interests at Seoul during and following the Sino-Japanese War.

1895 – Colombia. March 8 and 9. US forces protected American interests during an attack on the town of Bocas del Toro by a bandit chieftain.

1895-96 – Venezuela. Settlement of boundary dispute.

1896 – Nicaragua. May 2 to 4. US forces protected American interests in Corinto during political unrest.

1898 – Nicaragua. February 7 and 8. US forces protected American lives and property at San Juan del Sur.

1898 – Spanish-American War On April 25, 1898, the United States declared war with Spain. The war followed a Cuban insurrection, the Cuban War of Independence against Spanish rule and the sinking of the USS Maine in the harbor at Havana.

1898-99 – Samoa. Second Samoan Civil War a conflict that reached a head in 1898 when Germany, the United Kingdom, and the United States were locked in dispute over who should have control over the Samoan island chain.

1898-99 – China. November 5, 1898 to March 15, 1899. US forces provided a guard for the legation at Peking and the consulate at Tientsin during contest between the Dowager Empress and her son.

1899 – Nicaragua. American and British naval forces were landed to protect national interests at San Juan del Norte, February 22 to March 5, and at Bluefields a few weeks later in connection with the insurrection of Gen. Juan P. Reyes.

1899-1913 – Philippine Islands. Philippine-American War US forces protected American interests following the war with Spain, defeating rebellious Filipinos seeking immediate national independence. The U.S. government declared the "insurgency" officially over in 1902, when the Filipino leadership generally accepted American rule. Skirmishes between government troops and armed groups lasted until 1913, and some historians consider these unofficial extensions of the war.

*** 1900-1909

1900 – China. May 24 to September 28. Boxer Rebellion American troops participated in operations to protect foreign lives during the Boxer rising, particularly at Peking. For many years after this experience a permanent legation guard was maintained in Peking, and was strengthened at times as trouble threatened.

1901 – Colombia (State of Panama). November 20 to December 4. (See: Separation of Panama from Colombia) US forces protected American property on the Isthmus and kept transit lines open during serious revolutionary disturbances.

1902 – Colombia. - April 16 to 23. US forces protected American lives and property at Bocas del Toro during a civil war.

1902 – Colombia (State of Panama). September 17 to November 18. The United States placed armed guards on all trains crossing the Isthmus to keep the railroad line open, and stationed ships on both sides of Panama to prevent the landing of Colombian troops.

1903 – Honduras. March 23 to 30 or 31. US forces protected the American consulate and the steamship wharf at Puerto Cortes during a period of revolutionary activity.

1903 – Dominican Republic. March 30 to April 21. A detachment of marines was landed to protect American interests in the city of Santo Domingo during a revolutionary outbreak.

1903 – Syria. September 7 to 12. US forces protected the American consulate in Beirut when a local Muslim uprising was feared.

1903-04 – Abyssinia (Ethiopia). Twenty-five marines were sent to Abyssinia to protect the US Consul General while he negotiated a treaty.

1903-14 – Panama. US forces sought to protect American interests and lives during and following the revolution for independence from Colombia over construction of the Isthmian Canal. With brief intermissions, United States Marines were stationed on the Isthmus from November 4, 1903, to January 21, 1914 to guard American interests.

1904 – Dominican Republic. January 2 to February 11. American and British naval forces established an area in which no fighting would be allowed and protected American interests in Puerto Plata and Sosua and Santo Domingo City during revolutionary fighting.

1904 – Tangier, Morocco. "We want either Perdicaris alive or Raisuli dead." A squadron demonstrated to force release of a kidnapped American. Marines were landed to protect the consul general.

1904 – Panama. November 17 to 24. U.S forces protected American lives and property at Ancon at the time of a threatened insurrection.

1904-05 – Korea. January 5, 1904, to November 11, 1905. A guard of Marines was sent to protect the American legation in Seoul during the Russo-Japanese War.

1906-09 – Cuba. September 1906 to January 23, 1909. US forces sought to protect interests and re-establish a government after revolutionary activity.

1907 – Honduras. March 18 to June 8. To protect American interests during a war between Honduras and Nicaragua, troops were stationed in Trujillo, Ceiba, Puerto Cortes, San Pedro Sula, Laguna and Choloma.

*** 1910-1919

1910 – Nicaragua. May 19 to September 4, 1910. Occupation of Nicaragua US forces protected American interests at Bluefields.

1911 – Honduras. January 26. American naval detachments were landed to protect American lives and interests during a civil war in Honduras.

1911 – China. As the Tongmenghui-led Xinhai Revolution approached, in October an ensign and 10 men tried to enter Wuchang to rescue missionaries but retired on being warned away, and a small landing force guarded American private property and consulate at Hankow. Marines were deployed in November to guard the cable stations at Shanghai; landing forces were sent for protection in Nanking, Chinkiang, Taku and elsewhere.

1912 – Honduras. A small force landed to prevent seizure by the government of an American-owned railroad at Puerto Cortes. The forces were withdrawn after the United States disapproved the action.

1912 – Panama. Troops, on request of both political parties, supervised elections outside the Panama Canal Zone.

1912 – Cuba. June 5 to August 5. U.S. forces protected American interests in the province of Oriente and in Havana.

1912 – China. August 24 to 26, on Kentucky Island, and August 26 to 30 at Camp Nicholson. US forces protected Americans and American interests during the Xinhai Revolution.

1912 – Turkey. November 18 to December 3. U.S. forces guarded the American legation at Constantinople during the First Balkan War

1912-25 – Nicaragua. August to November 1912. U.S. forces protected American interests during an attempted revolution. A small force, serving as a legation guard and seeking to promote peace and stability, remained until August 5, 1925.

1912-41 – China. The disorders which began with the overthrow of the dynasty during Kuomintang rebellion in 1912, which were redirected by the invasion of China by Japan, led to demonstrations and landing parties for the protection of US interests in China continuously and at many points from 1912 on to 1941. The guard at Peking and along the route to the sea was maintained until 1941. In 1927, the United States had 5,670 troops ashore in China and 44 naval vessels in its waters. In 1933 the United States had 3,027 armed men ashore. The protective action was generally based on treaties with China concluded from 1858 to 1901.

1913 – Mexico. September 5 to 7. A few marines landed at Ciaris Estero to aid in evacuating American citizens and others from the Yaqui Valley, made dangerous for foreigners by civil strife.

1914 – Haiti. January 29 to February 9, February 20 and 21, October 19. Intermittently US naval forces protected American nationals in a time of rioting and revolution.The specific order from the Secretary of the Navy to the invasion commander, Admiral William Deville Bundy, was to "protect American and foreign" interests.

1914 – Dominican Republic. June and July. During a revolutionary movement, United States naval forces by gunfire stopped the bombardment of Puerto Plata, and by threat of force maintained Santo Domingo City as a neutral zone.

1914-17 – Mexico. Tampico Affair led to Occupation of Veracruz, Mexico. Undeclared Mexican-American hostilities followed the Tampico Affair and Villa's raids . Also Pancho Villa Expedition) – an abortive military operation conducted by the United States Army against the military forces of Francisco "Pancho" Villa from 1916 to 1917 and included capture of Vera Cruz. On March 19, 1915 on orders from President Woodrow Wilson, and with tacit consent by Venustiano Carranza General John J. Pershing led an invasion force of 10,000 men into Mexico to capture Villa.

1915-34 – Haiti. July 28, 1915, to August 15, 1934. United States occupation of Haiti 1915-1934 US forces maintained order during a period of chronic political instability.During the initial entrance into Haiti, the specific order from the Secretary of the Navy to the invasion commander, Admiral William Deville Bundy, was to "protect American and foreign" interests.

1916 – China. American forces landed to quell a riot taking place on American property in Nanking.

1916-24 – Dominican Republic. May 1916 to September 1924. Occupation of the Dominican Republic American naval forces maintained order during a period of chronic and threatened insurrection.

1917 – China. American troops were landed at Chungking to protect American lives during a political crisis.

1917-18 – World War I. On April 6, 1917, the United States declared war with Germany and on December 7, 1917, with Austria-Hungary. Entrance of the United States into the war was precipitated by Germany's submarine warfare against neutral shipping and the Zimmermann Telegram.

1917-22 – Cuba. US forces protected American interests during insurrection and subsequent unsettled conditions. Most of the United States armed forces left Cuba by August 1919, but two companies remained at Camaguey until February 1922.

1918-19 – Mexico. After withdrawal of the Pershing expedition, U.S. troops entered Mexico in pursuit of bandits at least three times in 1918 and six times in 1919. In August 1918 American and Mexican troops fought at Nogales, The Battle of Ambos Nogales. The incident began when German spies plotted an attack with Mexican soldiers on Nogales Arizona. The fighting began when a Mexican officer shot and killed a U.S. soldier on American soil. A full scale battle then ensued, ending with a Mexican surrender.

1918-20 – Panama. US forces were used for police duty according to treaty stipulations, at Chiriqui, during election disturbances and subsequent unrest.

1918-20 – Soviet Union. Marines were landed at and near Vladivostok in June and July to protect the American consulate and other points in the fighting between the Bolshevik troops and the Czech Army which had traversed Siberia from the western front. A joint proclamation of emergency government and neutrality was issued by the American, Japanese, British, French, and Czech commanders in July. In August 7,000 men were landed in Vladivostok and remained until January 1920, as part of an allied occupation force. In September 1918, 5,000 American troops joined the allied intervention force at Archangel and remained until June 1919. These operations were in response to the Bolshevik revolution in Russia and were partly supported by Czarist or Kerensky elements.  For details, see the American Expeditionary Force Siberia and the American Expeditionary Force North Russia.

1919 – Dalmatia (Croatia). US forces were landed at Trau at the request of Italian authorities to police order between the Italians and Serbs.

1919 – Turkey. Marines from the USS Arizona were landed to guard the US Consulate during the Greek occupation of Constantinople.

1919 – Honduras. September 8 to 12. A landing force was sent ashore to maintain order in a neutral zone during an attempted revolution

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