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- U-boat campaignWWI German naval campaign to attack Allied trade routes (1914–18)
- U.S. policy towards authoritarianismUnited States foreign policy regarding authoritarian governments
- U.S. Steel recognition strike of 1901The U.S. Steel recognition strike of 1901 was an attempt by the Amalgamated Association of
- Ukrainian decommunization laws2015 laws banning communist symbols
- Ukrainian Galician ArmyArmy of the West Ukrainian People's Republic
- Ukrainian Insurgent ArmyUkrainian nationalist partisan organisation active during and after World War II
- Ukrainian People's MilitsiyaMilitary unit
- Ukrainian People's Republic1917–18/1918–21 state in Eastern Europe
- Ukrainian Soviet Socialist RepublicSoviet republic from 1919 to 1991
- Ukrainian War of IndependenceEastern European military conflict (1917–1921)
- Ulm campaign1805 campaign during the War of the Third Coalition
- UlundiUlundi, also known as Mahlabathini, is a town in the Zululand District Municipality. At on
- Unconditional surrenderAn unconditional surrender is a surrender in which no guarantees, reassurances, or promise
- Underground RailroadNetwork for fugitive slaves in 19th-century U.S.
- Unequal treatiesAgreements imposed on Asian states
- Unification of Germany1866–1871 consolidation of German states
- Unification of Italy1848–1870 consolidation of Italian states
- Union (American Civil War)US federal government from 1861 to 1865
- Union armyLand branch of the army that fought for the Union during the American Civil War
- Union between Sweden and NorwayPersonal union of Sweden and Norway (1814–1905)
- Union of South AfricaBritish dominion in southern Africa from 1910 to 1961
- Unit 731Japanese biological and chemical warfare research facility (1936–1945)
- United Daughters of the ConfederacyAmerican hereditary association
- United Kingdom of Great Britain and IrelandSovereign state in Northwestern Europe (1801–1922)
- United Nations Partisan Infantry Korea1952–1954 Korean War guerrilla unit
- United Restoration ArmyThe United Restoration Army, also called simply as the Restoration Army, was a land milita
- United States ArmyLand service branch of the U.S. military
- United States Army Air ForcesAerial warfare branch from 1941 to 1947
- United States Asiatic FleetThe United States Asiatic Fleet was a fleet of the United States Navy during much of the f
- United States Department of Justice Civil Rights DivisionFederal institution
- United States home front during World War IIThe United States home front during World War II supported the war effort in many ways, in
- United States NavyMaritime service branch of the U.S. military
- United States occupation of Haiti1915–1934 military occupation
- United States occupation of Nicaragua1912–1933 occupation as part of the Banana Wars
- United States Pacific FleetUS Navy theater-level component command
- United States Rangers in the War of 1812United States Rangers were originally raised for Tecumseh's War, but they continued to ser
- Universal manhood suffrageVoting rights system
- Uprising in NagykanizsaThe Uprising in Nagykanizsa was a revolt during the Hungarian War of Independence of 1848-
- Ural ArmyThe Ural Separate Army was a military formation of the White Army during the Russian Civil
- Urban politics in the United StatesAmerican urban politics refers to politics within cities of the United States of America.
- Urtatagai conflict (1925–1926)The Urtatagai conflict was a conflict between the Soviet Union and the Emirate of Afghanis
- USS Boston (1884)The fifth USS Boston was a protected cruiser and one of the first steel warships of the "N
- USS CairoUSS Cairo is the lead ship of the City-class casemate ironclads built at the beginning of
- USS Frolic (1813)USS Frolic was a sloop-of-war that served in the United States Navy in 1814. The British c
- USS Nashville (PG-7)USS Nashville (PG-7), a gunboat, was the only ship of its class. It was the first of three
- USS Oahu (PR-6)The first USS Oahu (PR-6), a Yangtze River gunboat, was laid down by Kiangnan Dock and Eng
- USS Panay incidentJapanese attack on a US gunboat in 1937
- USS Plymouth (1844)USS Plymouth was a sloop-of-war constructed and commissioned just prior to the Mexican–Ame
- USS President MonroeUSS President Monroe (AP-104) was a President Jackson-class attack transport. that served
- USS Quail (AM-15)USS Quail (AM-15) was a U.S. Navy Lapwing-class minesweeper, named after the quail, a migr
- USS Saratoga (1842)USS Saratoga, a sloop-of-war, was the third ship of the United States Navy to be named for
- USSR anti-religious campaign (1921–1928)Campaign of anti-religious persecution
- USSR anti-religious campaign (1928–1941)Stalinist USSR's promotion of state atheism
- USSR anti-religious campaign (1958–1964)Nikita Khrushchev's anti-religious campaign was the last large-scale anti-religious campai
- Uyoku dantaiUltranationalist far-right groups in Japan
- Uys KrigeMattheus Uys Krige (4 February 1910 – 10 August 1987) was a South African writer of novels
- Uzbek Soviet Socialist RepublicConstituent republic of the Soviet Union