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- Abdication of Nicholas II1917 renunciation of the throne of the Russian Empire
- Abdication of Wilhelm II1918 renunciation of the throne of Prussia and the German Empire
- Abel DouayCharles Abel Douay (2 March 1809 – 4 August 1870) was a general in the French army during
- Aberdeen ministryAfter the collapse of Lord Derby's minority government, the Whigs and Peelites formed a co
- Abolition of the CaliphateAbolition of the last remnant of the former monarchy in Turkey
- Abolition of the han system1871 reform abolishing the feudal system in Meiji-era Japan
- Abolition of the Ottoman sultanateAbolition of the monarchy in Turkey
- AbolitionismMovement to end slavery
- Aboriginal TasmaniansIndigenous people of the Australian island state of Tasmania
- Abraham Lincoln in the Black Hawk WarAbraham Lincoln served as a volunteer in the Illinois Militia from April 21, 1832 to July
- Abraham Lincoln's farewell address1861 speech upon leaving Springfield, Illinois
- Abraham Lincoln's first inaugural address1861 speech by Abraham Lincoln
- Abraham Lincoln's hearseMotor vehicle
- Abraham Lincoln's Lyceum address1838 speech by Abraham Lincoln
- Abraham Lincoln's patentInvention to lift boats, by the President
- Abraham Lincoln's Peoria speech1854 speech by Abraham Lincoln
- Abraham Lincoln's second inaugural address1865 speech by the U.S. President
- Act on National Flag and AnthemJapanese law ratified in 1999
- Act Prohibiting Importation of SlavesUS Congressional Act of 1807
- Action Conservative MovementFar-right movement in Japan
- Action of 13 January 1797The action of 13 January 1797 (known by the French as the Naufrage du Droits de l'Homme; "
- Action of 15 July 1798The action of 15 July 1798 was a minor naval battle of the French Revolutionary Wars, foug
- Action of 16 October 1799The action of 16 October 1799 was a minor naval engagement during the French Revolutionary
- Action of 18 June 1793The action of 18 June 1793 was one of the most celebrated encounters between British and F
- Action of 18 June 1799The action of 18 June 1799 was a naval engagement of the French Revolutionary Wars fought
- Action of 19 December 1796The action of 19 December 1796 was a minor naval engagement of the French Revolutionary Wa
- Action of 20 October 179349°40′03″N 1°15′09″W / 49.667611°N 1.252417°W
- Action of 24 June 1795The action of 24 June 1795 was a minor naval engagement fought in the Western Basin of the
- Action of 25 January 1797The action of 25 January 1797 was a minor naval battle of the French Revolutionary Wars, f
- Action of 26 April 1797The action of 26 April 1797 was a minor naval engagement during the French Revolutionary W
- Action of 27 June 1798The action of 27 June 1798 was a minor naval engagement between British and French frigate
- Action of 30 May 1798The action of 30 May 1798 was a minor naval engagement between a small British squadron an
- Action of 30 October 1762The action of 30 October 1762 was a minor naval battle that was fought in the San Bernardi
- Action of 31 July 179340°15′50″N 73°50′10″W / 40.26389°N 73.83611°W The action of 31 July 1793 was an inconclusi
- Action of 7 July 1799The action of 7 July 1799 was a minor naval engagement of the Napoleonic Wars in which the
- Actions in Inner Mongolia (1933–1936)Military operations in China by Japan
- Actions of 5–6 May 1945The last actions of the Battle of the Atlantic in American waters took place on 5–6 May 19
- Adams–Onís TreatyTreaty ceding Spanish Florida to the U.S. (1819)
- Administrative divisions of the Armenian Soviet Socialist RepublicBetween 1929 and 1995, Armenia's administrative subdivisions consisted of up to 37 raions
- Administrator of Affairs of the Soviet UnionSoviet Union government official
- Adolf BurgerAdolf Burger (12 August 1917 – 6 December 2016) was a Slovak Jewish typographer, memoir wr
- Adolf Hitler's cult of personalityAdolf Hitler's cult of personality was a prominent feature of Nazi Germany (1933–1945), wh
- Adolf Hitler's rise to powerEvents leading to Hitler's dictatorship of Germany
- Adolphe GuillaumatMarie Louis Adolphe Guillaumat (4 January 1863 – 18 May 1940) was a French Army general du
- Adriatic Campaign of World War I1914–1918 naval campaign
- Adriatic campaign of World War IIMinor naval campaign fought during World War II
- Adubi WarConflict in the British Colony and Protectorate of Nigeria
- Aerial warfare in the Winter WarThe aerial warfare in the Winter War was the aerial aspect of the Winter War between Finla
- Afghan Civil War (1928–1929)Military conflict in Afghanistan
- Afghan conflictNear-continuous series of wars in Afghanistan
- Afghan nationalismForm of nationalism relating to the Afghan national identity
- African theatre of World War ITheatre of operations during World War I
- Afrika KorpsGerman expeditionary military force deployed to North Africa
- Aftermath of the Iranian RevolutionFollowing the Iranian Revolution, which overthrew the Shah of Iran, in February 1979, Iran
- Aftermath of the Winter WarThe aftermath of the Winter War covers the historical events and views following the Winte
- Aftermath of World War IEvents after the end of the war in 1918
- Agadir Crisis1911 diplomatic crisis
- Air commanders of World War IThe air commanders of World War I were army or navy officers who came to command air servi
- Air raids on JapanAerial bombing of Japan during World War II
- Air warfare of World War IIAir warfare was a major component in all theaters of World War II and, together with anti-
- AirspacePortion of the atmosphere controlled by a country
- AirstrikeOffensive military operation
- Akaka BillThe Native Hawaiian Government Reorganization Act of 2009 S1011/HR2314 was a bill before t
- Aktion T4Nazi involuntary euthanasia programme
- Åland War1850s Baltic Sea theater of the Crimean War
- Alaska Purchase1867 sale by Russia to the United States
- Albanian–Soviet split1956–1961 deterioration of bilateral relations
- Albert KautzRear Admiral Albert Kautz (January 29, 1839 – February 6, 1907) was an officer of the Unit
- Alexander I of YugoslaviaKing of Yugoslavia from 1921 to 1934
- Alexander MadieboAlexander A. Madiebo (29 April 1932 – 3 June 2022) was a Biafran soldier. He served as the
- Alexander Tormasov55°42′53″N 37°36′6.7″E / 55.71472°N 37.601861°E
- Alexander von KluckAlexander Heinrich Rudolph von Kluck (20 May 1846 – 19 October 1934) was a German general
- Alexander von KrobatinAlexander Freiherr von Krobatin (12 September 1849 – 28 September 1933) was an Austrian fi
- Alfred GaseleeGeneral Sir Alfred Gaselee, GCB, GCIE, (3 June 1844 – 29 March 1918) was a soldier who ser
- Algerian War1954–1962 war of Algerian independence from France
- Ali DinarSultan of Darfur
- Allen DullesDirector of Central Intelligence from 1953 to 1961
- Allied Force HeadquartersAllied Force Headquarters (AFHQ) was the headquarters that controlled all Allied operation
- Allied intervention in the Russian Civil WarForeign interventions in Russia between 1918 and 1925
- Allied invasion of Italy1943 military campaign of World War II
- Allied invasion of SicilyPart of World War II in 1943
- Allied logistics in the Kokoda Track campaignDuring the Second World War, Allied logistics in Papua played a crucial role in bringing t
- Allied plans for German industry after World War IIThe industrial plans for Germany were designs the Allies of World War II considered imposi
- Allied-occupied AustriaPost-World War II occupation of Austria
- Allied-occupied GermanyPost-World War II occupation of Germany
- Allies of World War IMilitary coalition in World War I
- Allies of World War IIMilitary coalition in World War II
- Alonso de RiberaAlonso de Ribera y Zambrano (Spanish pronunciation: ; 1560 – March 9, 1617) was a Spanish
- Alonso de SotomayorAlonso de Sotomayor y Valmediano (Spanish pronunciation: ; 1545–1610) was a Spanish conqui
- Alsace–Lorraine1871–1918 territory of the German Empire
- Altona Bloody Sunday1932 clash between Nazi and Communist demonstrators in Prussia
- American Civil War1861–1865 conflict in the United States
- American Confederation of VenezuelaThe American Confederation of Venezuela was an unrecognized state located in the Captaincy
- American entry into World War IThe United States entered World War I on April 6, 1917, more than two and a half years aft
- American frontierHistorical region of Western United States, c. 1607–1912
- American Indian WarsFrontier conflicts in the United States, 1609–1890s
- American logistics in the Normandy campaignAmerican logistics played a key role in the success of Operation Overlord, the Allied inva
- American System (economic plan)Protectionist economic policies of the early 19th-century United States
- American theater of World War IIWorld War II area of operations including North and South America
- American TianxiaAmerican Tianxia (Chinese: 美国天下; pinyin: Měiguó Tiānxià) is a term coined by the historian
- American transportation in the Siegfried Line campaignAmerican transportation played a crucial part in the military logistics of the World War I
- Amundsen's South Pole expedition1911 expedition to the South Pole
- Amur AnnexationRussian annexation of Outer Manchuria
- An Investigation of Global Policy with the Yamato Race as Nucleus1943 Japanese government report on racial theory and policy
- Anarchism in ChinaAnarchism in China was a strong intellectual force in the reform and revolutionary movemen
- Anarchism or Socialism?1906/1907 work by Joseph Stalin
- Andrew Jackson 1828 presidential campaignAmerican political campaign
- Andrew Jackson and land speculationAndrew Jackson, who became the seventh U.S. president in 1828, was personally involved in
- Andrew Jackson and slaveryAspect of U.S. history
- Andrew Jackson and the slave trade1828 U.S. campaign issue
- Andrew JohnsonPresident of the United States from 1865 to 1869
- Andrew Johnson National Historic SiteAndrew Johnson National Historic Site is a National Historic Site in Greeneville, Tennesse
- Anfal campaignOperation targeting rural Kurdish civilians in 1988
- Angell Treaty of 1880The Angell Treaty of 1880 (Chinese: 中美續修條約), formally known as the Treaty Regulating Immig
- Angelo ParonaAngelo Parona (23 April 1889 – 14 May 1977) was an Italian admiral during World War II.
- Anglo-Ashanti wars1824–1900 series of wars in West Africa
- Anglo-Burmese WarsThree wars between Britain and Burma
- Anglo-Dutch Treaty of 18141814 treaty ending British occupation of Dutch colonies
- Anglo-Dutch Treaty of 1824Treaty between the United Kingdom and the Netherlands
- Anglo-Egyptian conquest of SudanThe Anglo-Egyptian conquest of Sudan in 1896–1899 was a reconquest of territory lost by th
- Anglo-Egyptian Sudan1899–1956 period of Anglo-Egyptian rule in Sudan
- Anglo-Egyptian War1882 British conquest of Egypt
- Anglo-French Supreme War CouncilThe Anglo-French Supreme War Council (SWC) was established to oversee joint military strat
- Anglo-German Naval AgreementInter-war arms limitation agreement between the United Kingdom and Germany
- Anglo-German naval arms raceEarly 20th-century arms race between the United Kingdom and Germany
- Anglo-Irish Treaty1921 agreement which ended the Irish War of Independence
- Anglo-Irish Treaty Dáil voteThe Anglo-Irish Treaty was signed in London on 6 December 1921 and Dáil Éireann voted to a
- Anglo-Japanese Alliance1902–1922 defence pact
- Anglo-Russian Convention1907 treaty between the United Kingdom and Russia
- Anglo-Soviet invasion of Iran1941 conflict of World War II
- Anglo-Zanzibar War1896 military conflict in East Africa
- Anglo-Zulu WarBritish colonial war in 1879
- Angolan Civil War1975–2002 military conflict
- Annam (French protectorate)1883–1949 French protectorate in southeast Asia
- Annan (Tang protectorate)Annan (Chinese: 安南; pinyin: Ānnán; Vietnamese: An Nam; "pacified south") was an imperial p
- AnnexationConcept in political science
- Anschluss1938 annexation of Austria into Nazi Germany
- Antarctica during World War IIInternational competition extended to the continent of Antarctica during the World War II
- Antebellum SouthHistorical period in the Southern United States from 1815 to 1861
- Anthony van DiemenAnthony van Diemen (also Antonie, Antonio, Anton, Antonius; 1593 – 19 April 1645) was a Du
- Anthony Van EgmondAnthony Van Egmond (born Antonij Jacobi Willem Gijben, 10 March 1778 – 5 January 1838) was
- Anti anti-communismOpposition to anti-communism as applied in the Cold War
- Anti-Chinese sentimentHostility or prejudice toward Chinese people
- Anti-Chinese sentiment in JapanAnti-Chinese sentiment has been present in Japan since ancient times. While Japan was hist
- Anti-Comintern Pact1936 treaty signed by Germany and Japan
- Anti-communism in ChinaAnti-communism in China has a long history. Before the Chinese Communist Revolution, anti-
- Anti-communist insurgencies in Central and Eastern EuropeAnti-communist insurgencies continued in Central and Eastern Europe during and after World
- Anti-communist mass killingsPolitically motivated mass killings of communists
- Anti-communist resistance in Poland (1944–1953)Resistance against the communist government in Poland
- Anti-communist resistance in Poland (1944–1989)1944–1989 resistance
- Anti-Communist Volunteer MilitiaMilitary unit
- Anti-Fascist Council for the National Liberation of YugoslaviaWorld War II-era political body
- Anti-Gold Licence AssociationThe Anti-Gold Licence Association, was formed in Bendigo, Victoria, Australia on 6 June 18
- Anti-Infiltration ActLaw of Taiwan
- Anti-Korean sentiment in JapanAnti-Korean sentiment in Japan refers to opposition, hostility, hatred, distrust, fear, an
- Anti-Russian sentimentAnti-Russian sentiment or Russophobia is the dislike or fear of Russia, Russian people, or
- Anti-Slavic sentimentHostility, prejudice, or discrimination against Slavic peoples
- Anti-Socialist LawsLaw of the German Empire
- Anti-Soviet partisansAnti-Soviet guerrilla movements
- Anti-Soviet resistance by the Ukrainian Insurgent ArmyUkrainian nationalist Insurgency against the Soviet Union
- Anti-SovietismOpposition to the Soviet Union
- Anti-Vietnamese sentimentAnti-Vietnamese sentiment (Vietnamese: chủ nghĩa bài Việt Nam) involves hostility or hatre
- Anti–North Korean sentimentAnti-North Korean sentiment or anti-Democratic People's Republic of Korea sentiment (simpl
- Anti–People's Republic of China sentimentOpposition to the Chinese government
- Antifascistisk AktionThe Antifascistisk aktion (AFA) is a far-left, extra-parliamentary, anti-fascist movement
- Antisemitism in the Soviet UnionFollowing the 1917 February Revolution in Russia, all legal restrictions on Russian Jews w
- Antoine ChanzyAntoine Eugène Alfred Chanzy (French pronunciation: ; 18 March 1823 – 4 January 1883) was
- Anton Reinhard FalckAnton Reinhard Falck (19 March 1777 in Utrecht – 16 March 1843 in Brussels) was a Dutch st
- Antoni SzyllingAntoni Szylling (31 August 1884 – 17 June 1971) was a Polish general, considered, along wi
- Antonio de QuintanillaAntonio Quintanilla (Pámanes, Spain; 1787 - † Almería, Spain; 1863) was a Spanish brigadie
- ApartheidSouth African system of racial segregation
- Apology ResolutionPublic Law 103-150, informally known as the Apology Resolution, is a Joint Resolution of t
- April CrisisPolitical crisis during the Russian Revolution
- April Theses1917 directives by Vladimir Lenin
- Arab Higher CommitteePolitical organ of Palestinian Arabs in Mandatory Palestine
- Arab Revolt1916–1918 uprising against the Ottoman Turks
- Arab Spring2010s protests and revolutions in the Arab world
- Arab–Israeli conflictGeopolitical conflict in the Middle East
- Arauco WarConflict between Spanish settlers of Chile and indigenous peoples (16th–17th centuries)
- Arbitrary arrest and detentionDeprivation of liberty without regard to applicable law
- Arc de TriompheTriumphal arch in Paris, France
- Archivo General de la Nación (Mexico)The Archivo General de la Nación (Spanish for "General Archive of the Nation"; abbreviated
- Arctic explorationPhysical exploration of the Arctic region
- Arctic naval operations of World War IINaval theatre of operations
- ArdennesLow mountain range in Belgium, Luxembourg, Germany and France
- Argentine Civil WarsConflicts within Argentina from 1814 to 1880
- Argentine War of IndependenceSecessionist civil war (1810–1825)
- Arica Province (Peru)Arica was a historical province of Peru, which existed between 1823 and 1883. It was popul
- Arikara scoutsArikara scouts were enlisted men from the Arikara Nation serving in the U.S. Army at diffe
- Aritomo GotōAritomo Gotō (五藤 存知, Gotō Aritomo, 23 January 1888 – 12 October 1942) was an admiral in th
- Armand du Paty de ClamCharles Armand Auguste Ferdinand Mercier du Paty de Clam (21 February 1853 – 3 September 1
- Armand HuyghéArmand Christophe Huyghé (11 July 1871 – 2 March 1944), later knighted Armand Huyghé de Ma
- Armée de la LoireThe Armée de la Loire was a French army of the Franco-Prussian War. It was formed in Octob
- Armée JuiveThe Armée Juive (Jewish Army), was a Zionist resistance movement in Nazi occupied Vichy Fr
- Armée secrèteThe armée secrète was a French military organization active during World War II. The colle
- Armenian genocideSystematic campaign in the Ottoman Empire
- Armenian genocide denialArmenian genocide denial is the negationist claim that the Ottoman Empire and its ruling p
- Armenian national movementBattles involving Armenian National movement
- Armenian questionPolitical debate of 1878 Berlin Congress
- Armenian resistance during the Armenian genocideArmenian resistance in the Ottoman Empire during WWI
- Armenian Soviet Socialist RepublicSoviet republic from 1920 to 1991
- Armenian–Azerbaijani war (1918–1920)Battles involving Armenian National movement
- Armenians in the Ottoman EmpireArmenians were a significant minority in the Ottoman Empire. They belonged to either the A
- Armistice of 11 November 1918Armistice ending the First World War
- Armistice of Cassibile1943 armistice ending the hostilities between Italy and the Allies
- Armistice of Mudros1918 truce between Ottoman Empire and Allied powers
- Armistice of Villa Giusti1918 convention between the Allies and Austria-Hungary
- Armor BranchThe Armor Branch is the armored warfare branch of the United States Army. This branch was
- Army and Navy Generalissimo's HeadquartersProvisional military government led by the Kuomintang from 1923-1925
- Army of the AlpsThe Army of the Alps (Armée des Alpes) was one of the French Revolutionary armies. It exis
- Army of the Ethiopian EmpireThe Army of the Ethiopian Empire was the principal land warfare force of the Ethiopian Emp
- Arso JovanovićArsenije "Arso" Jovanović (Serbian Cyrillic: Арсо Јовановић; 24 March 1907 – 12 August 194
- Arthur Dewey StrubleArthur Dewey Struble (June 28, 1894 – May 1, 1983) was a United States admiral who served
- Arthur Edward BarstowMajor-General Arthur Edward "Bustling Bill" Barstow, CIE, MC (17 March 1888 – 28 January 1
- Arthur LevesonAdmiral Sir Arthur Cavenagh Leveson GCB (27 January 1868 – 26 June 1929) was a senior offi
- Article 231 of the Treaty of VersaillesBeginning of the 1919 treaty's reparations section
- Asian and Pacific theatre of World War IDuring World War I, conflict on the Asian continent and the islands of the Pacific include
- Asian MonroeismAsian Monroeism (アジア・モンロー主義) or Far Eastern Monroeism (極東モンロー主義) is a form of Pan-Asianism
- AskariLocal soldier of a colonial army in Africa
- AspergAsperg (German pronunciation: ) is a town in the district of Ludwigsburg, Baden-Württember
- Assassination attempts on Adolf HitlerThis is an incomplete list of documented attempts to assassinate Adolf Hitler.
- Assassination attempts on NapoleonHistorian Philip Dwyer claims Napoleon faced between 20 and 30 assassination plots during
- Assassination of Abraham Lincoln1865 murder in Washington, D.C., U.S.
- Assassination of Archduke Franz Ferdinand1914 shooting in Sarajevo
- Assassination of Empress Myeongseong1895 murder in Seoul
- Assassination of Inejirō Asanuma1960 murder in Tokyo, Japan
- Aster RevolutionPost-WWI revolution in Hungary
- Atlantic U-boat campaign of World War IProlonged naval conflict between German submarines and the Allied navies during WWI
- Atomic bombings of Hiroshima and Nagasaki1945 attacks in Japan during WWII
- Atomic bombings of Hiroshima and Nagasaki in popular cultureThis is a list of cultural products made about the atomic bombings of Hiroshima and Nagasa
- Atomic spiesWWII Soviet nuclear-research spies in the West
- Atrocities in the Congo Free StateFrom 1885 to 1908, many atrocities were committed in the Congo Free State (today the Democ
- Attack on KarginskThe Attack on Karginsk took place on 14 July 1785. Sheikh Mansur attacked Karginsk Redoubt
- Attack on Mers-el-Kébir1940 British attack on the French Navy
- Attack on Pearl Harbor1941 Japanese attack on the US
- Attacks on Australia during World War IIAttacks on continental Australia during World War II were relatively rare due to Australia
- Attorney-General of FijiThe Attorney-General is a political and legal officer in Fiji. The attorney-general is the
- August Revolution1945 uprising ending the Vietnamese monarchy
- Auguste Henri BrincourtAuguste Henri Brincourt (June 25, 1823 - August 10, 1909) was a General of the French Army
- Auguste RaffetDenis Auguste Marie Raffet (2 March 1804 – 16 February 1860) was a French illustrator and
- Auschwitz concentration campNazi concentration camp in Poland (1940–1945)
- Auspicious Incident1826 disbandment of the Ottoman janissary corps
- Australian frontier wars1788–1934 conflicts between European settlers and Indigenous Australians
- Australian occupation of German New Guinea1914 World War I campaign
- Australian occupation of NauruOccupation of Nauru
- Austria-Hungary1867–1918 dual monarchy in Central Europe
- Austrian EmpireEmpire in Europe from 1804 to 1867
- Austrian GermanVariety of Standard German
- Austrian State Treaty1955 treaty re-establishing Austria as a sovereign state
- Austro-Hungarian ArmyLand force of the Austro-Hungarian Dual Monarchy from 1867 to 1918
- Austro-Hungarian campaign in Bosnia and Herzegovina in 18781878 conquest of Ottoman-controlled Bosnia and Herzegovina by Austria-Hungary
- Austro-Hungarian guldenCurrency of the lands of the House of Habsburg
- Austro-Hungarian rule in Bosnia and Herzegovina1878–1918 territory of Austria-Hungary
- Austro-Prussian War1866 war in Europe
- Austro-Serbian alliance of 18811881 secret bilateral treaty between Austria-Hungary and the Principality of Serbia
- Aviation in World War IUse of aircraft during the First World War
- Axis powersMajor alliance of World War II
- Azerbaijan Soviet Socialist RepublicSoviet republic from 1922 to 1991