China. August 24 to 26, on Kentucky Island, and August 26 to 30 at Camp Nicholson. U.S. forces protected Americans and American interests during revolutionary activity.
Turkey. November 18 to December 3. U.S. forces guarded the American legation at Constantinople during a Balkan War.
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.
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 U.S. 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.
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.
Haiti. January 29 to February 9, February 20 to 21, October 19. Intermittently U.S. naval forces protected American nationals in a time of rioting and revolution.
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.
Mexico. Undeclared Mexican-American hostilities followed the Dolphin affair and Villa’s raids and included capture of Vera Cruz and later Pershing’s expedition into northern Mexico.
Haiti. July 28, 1915, to August 15, 1934. U.S. forces maintained order during a period of chronic political instability.
China. American forces landed to quell a riot taking place on American property in Nanking.
Dominican Republic. May 1916 to September 1924. American naval forces maintained order during a period of chronic and threatened insurrection.
China. American troops were landed at Chungking to protect American lives during a political crisis.
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.
Cuba. U.S. forces protected American interests during an 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.
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.
Panama. U.S. forces were used for police duty according to treaty stipulations, at Chiriqui, during election disturbances and subsequent unrest.
Instances of Use of United States Armed Forces Abroad, 1798-2010
Congressional Research Service