The following is a list of border conflicts between two or more countries. The list includes only those fought because of border disputes. See list of territorial disputes for those that do not involve fighting. Over 50% of the world’s borders today were drawn as a result of British and French imperialism. The British and French drew the modern borders of the Middle East, 80% of the borders of Africa, in Asia after the independence of the British Raj and French Indochina and the borders of Europe after World War I as victors, as a result of the Paris treaties.Lovejoy, Paul E. (2012). Transformations of Slavery: A History of Slavery in Africa. London: Cambridge University Press.Martin Klein, "Slave Descent and Social Status in Sahara and Sudan", in Reconfiguring Slavery: West African Trajectories, ed. Benedetta Rossi (Liverpool: Liverpool University Press, 2009), 29.
19th century Start Finish Conflict Combatants Disputed Territories Fatalities 1811 1812 Portuguese invasion of the Banda Oriental v. United Provinces Banda Oriental Unknown 1816 1820 Portuguese conquest of the Banda Oriental v. Federal League Banda Oriental Unknown 1825 1828 Cisplatine War v. Banda Oriental Unknown 1828 1829 Gran Colombia–Peru War v. pre-modern Ecuador–Peru border ~7,600 1837 1838 Upper Canada Rebellion (Patriot War) (Province of Upper Canada) and United States v. Republic of Upper Canada Canada–United States border ~325 1837 1839 Tarija War v. Peru–Bolivian Confederation Tarija Department Unknown 1841 1843 Texas-Mexico boundary dispute Mexico v. New MéxicoRio Grande Unknown 1846 1848 Mexican–American War v. TexasSanta Fe de Nuevo MéxicoAlta California ~29,000 1859 1859 Pig and Potato War v. San Juan Islands None 1861 1865 War Between the States United States v. Fort Sumter, Charleston HarborArizona TerritoryBorder states ~1,692,0001864 1870 War of the Triple Alliance Paraguay v. Argentina, , and UruguayRío de la Plata Basin 378,000-500,000 1879 1883 War of the Pacific v. and Litoral Department ~10,0001885 1885 Panjdeh incident v. and Kushka (present-day Serhetabat, Turkmenistan) 400 or 1042 1896 1896 Battle of Shangi v. Kingdom of Rwanda Southwestern Rwanda Unknown 1898 1898 Fashoda Crisis v. Fashoda, Mahdist State (modern-day Sudan) None
20th century before World War II (1918-1939) Start Finish Conflict Combatants Disputed Territories Fatalities 1900 1900 Russian invasion of Manchuria (Boxers Rebellion) v. and Society of Righteous and Harmonious Fists Amur River More than 1000 1910 1918 Mexican Border War v. Mexico–United States border 100+ 1925 1925 Klaipėda Revolt under the French Administration v. Lithuania MemellandEast Prussia, Germany 15 1925 1925 War of the Stray Dog v. Petrich (modern borders with Greece and North Macedonia) 171 1932 1935 Chaco War v. Northern Gran Chaco ~100,000 1938 1938 Changkufeng Incident v. Manchukuo–Soviet Union border region ~1,300 1939 1939 Slovak–Hungarian War v. Eastern Slovakia 69 1939 1939 Nomonhan Incident and v. and Manchukuo–Soviet Union border region ~48,000
20th century after World War II (1945–2000) Start Finish Conflict Combatants Disputed Territories Fatalities 1945 1945 Levant Crisis v. Syria-Lebanon and Transjordan 019451946War in southern Vietnam v. Southern Vietnam2500+ 1946 1948 Beitashan Incident v. and Chinese–Mongolian border Unknown 1947 1948 1947–1948 Kashmir War v. Jammu and Kashmir 2000+19471948Annexation of Junagadh v. Junagadh StateUnknown194819481948 Arab-Israel War and v. Mandatory Palestine10000+19481948Annexation of Hyderabad v. Hyderabad1000+19491956Palestinian Fedayeen insurgency v. West Bank and Israel3300+19501950Chinese Invasion of Tibet v. Chamdo200+19501953Korean War v. Korea3000000+ 1954 1954 Annexation of Dadra and Nagar Haveli v. Dadra and Nagar Haveli 219541955First Taiwan Strait Crisis v. and Taiwan Strait900+ 1956 1956 Suez Crisis v. Sinai PeninsulaSuez Canal Zone 1800+ 1957 1958 Ifni War v. and Spanish Ifni 1000+19581958Second Taiwan Strait Crisis v. and Quemoy and Amoy950+195819581958 Pakistan–India border skirmish v. East Pakistan Border5+19591960Dir campaign v. and Dir stateDurand LineUnknown19601961Bajaur Campaign v. and Dir militantsDurand LineUnknown19611961Annexation of Goa v. Goa, Daman and Diu50+19611961Operation Vantage and v. KuwaitUnknown19611962Western New Guinea War and v. Western New Guinea 210+ 1962 1962 Sino-Indian War v. Aksai Chin 2000+19641964First Ethio–Somali Border War v. Ethiopia–Somalia border1000+ 1965 1965 Indo-Pakistani War of 1965 v. Kashmir 5000+19671967Nathu La and Cho La clashes v. Nathu La and Cho La (Sikkim and Tibet)110+19671967Six-Day War, and v. Golan Heights, Sinai Peninsula, West Bank, Gaza12000+ 1969 1969 Sino-Soviet border conflict v. Zhenbao IslandUssuri River 120+ 1971 1971 Indo-Pakistani War of 1971 v. Kashmir 4000+19721972First Yemenite War v. North Yemen–South Yemen borderUnknown197319731973 Samita border skirmish v. Samita border OutpostUnknown19731973Yom Kippur War and v. Golan Heights, Sinai Peninsula, Suez Canal 22000+19741975 Shatt al-Arab conflict v. Shatt al-Arab 1000+19741974Turkish invasion of Cyprus v. and Cyprus7000+19751975Tulung La incident v. Arunachal Pradesh419751991Western Sahara War and v. Western Sahara2000+19751978Indonesian invasion of East Timor v. East Timor186000+19771978Ogaden War v. , and Ogaden12000+ 1978 1979 Uganda–Tanzania War v. Kagera Salient 200019791979Second Yemenite War v. North Yemen–South Yemen border2700+ 1979 1979 Sino-Vietnamese War v. Cao Bằng, Lạng Sơn and Spratly Islands 50000+19801988Iran–Iraq War v. Western Iran500000+19812005Bakassi clashes v. Cameroon–Nigeria border7019811981Paquisha War v. Cordillera del Cóndor50+ 1982 1982 Falklands War v. Falkland Islands,South Georgia and the South Sandwich Islands 800+19821982Second Ethio–Somali Border War v. Hiran and Mudug regions400+19831983Chadian–Nigerian War v. Lake Chad 100+ 1984 2022 Whisky War v. Hans Island 0 1984 2003 Siachen conflict v. Siachen Glacier 1000 1985 1985 Agacher Strip War v. Agacher Strip 140+19852000South Lebanon conflict and vs Southern Lebanon2300+ 1986 1987 Sumdorong Chu standoff v. Sumdorong Chu Unknown19861987Ciskei–Transkei War v. Ciskei-Transkei BorderUnknown 1987 1988 Thai–Laotian Border War and v. Chat Trakan districtBotene district 140+19871993First Palestinian Intifada v. West Bank and Gaza Strip2000+19881988Johnson South Reef skirmish v. Johnson South Reef60+19881988First Nagorno-Karabakh War v. Nagorno-Karabakh17000+19891991Mauritania–Senegal Border War v. Mauritania–Senegal borderUnknown19951996Third Taiwan Strait Crisis v. and Taiwan StraitUnknown19951995Hanish Islands conflict v. Hanish Islands20+19982000Eritrean–Ethiopian War v. Badme300000 1998 2018 Eritrean–Ethiopian border conflict v. Eritrea–Ethiopia border 10000019991999Kargil War v. Kargil district900+
21st century Start Finish Conflict Combatants Disputed Territory Fatalities20002005Second Palestine Intifada v. Israeli-occupied territories4000+ 2000 2006 2000–2006 Shebaa Farms conflict v. Shebaa farms 30+ 2001 2001 2001 Bangladesh–India border clashes v. Bangladesh–India border region 19 2001 2002 2001–2002 India–Pakistan standoff v. Kashmir 700+ 2002 2002 Perejil Island crisis v. Perejil Island 0 2003 2005 Conflict in Tuzla Island v. Tuzla Island 0 2006 2006 2006 Lebanon War v. and Northern District, Southern Lebanon, Golan Heights 1500+ 2008 2008 Djiboutian–Eritrean border conflict v. Ras Doumeira 140+200820082008 Mardakert clashes v. Line of Contact4+ 2008 2008 Russo-Georgian War v. South Ossetia and Abkhazia 340+ 2008 2011 2008–2011 Cambodian–Thai border crisis v. Preah Vihear 25+ 2008 2008 2008 India–Pakistan standoff v. India–Pakistan border region Unknown200920092009 Afghanistan–Iran clash Iran v. AfghanistanAfghanistan–Iran border1201020102010 Mardakert clashes v. and Line of Contact6+ 2010 2010 Costa Rica–Nicaragua San Juan River border dispute v. San Juan River 020102010February 2010 Nagorno-Karabakh clashes v. Line of Contact3 2011 2011 Wazzin Clashes Libya v. Wazzin 20+ 2011 2011 2011 India–Pakistan border skirmish v. Kashmir 8 2012 2012 Heglig Crisis v. Unity StateSouth Kordofan 260+ 2012 2022 Syrian–Turkish border clashes during the Syrian civil war v. Akçakale 15+201220122012 Armenian–Azerbaijani border clashes v. Line of Contact9201220172012–2017 Lebanon–Syria border clashes v. Lebanon–Syria border100+20122024Israeli–Syrian ceasefire line incidents during the Syrian civil war v. Quneitra Governorate and Golan Heights250+ 2013 2013 2013 India–Pakistan border skirmishes v. Kashmir Line of Control 28 2014 2015 2014–2015 India–Pakistan border skirmishes v. Kashmir Line of ControlIndo-Pakistani border region 55+201420142014 Armenian–Azerbaijani clashes v. Line of Contact10+201420142014 Russian annexation of Crimea v. Crimea320142022War in Donbas v. Donetsk and Luhansk oblasts10000+ 2016 2016 2016 Belize–Guatemala border standoff v. Sarstoon River 1 2016 2018 2016–2018 India–Pakistan border skirmishes v. Kashmir 165+ 2017 2017 2017 Afghanistan–Pakistan border skirmish v. Chaman 8+ 2017 2017 2017 China–India border standoff v. and Doklam 0 2018 2018 2018 Armenian–Azerbaijani clashes v. Nakhchivan Autonomous Republic 2+201820182018 Syrian Kurdish–Turkish border clashes v. Northern Syria5+ 2019 2019 2019 India–Pakistan border skirmishes v. Line of Control 50+ 2020 2020 2020 Armenian–Azerbaijani clashes v. Movses, Armenia and Ağdam, Azerbaijan 17+20202020Second Nagorno-Karabakh War v. Nagorno-Karabakh and Armenian-occupied territories 5000+ 2020 2021 2020–2021 China–India skirmishes v. Sikkim, Ladakh and Line of Actual Control 30+202020212020–21 India–Pakistan border skirmishes v. Line of Control, Kashmir40+ 2020 2022 Ethiopian–Sudanese border conflict v. Ethiopian–Sudanese border 90+ 2021 2021 2021 Kyrgyzstan–Tajikistan conflict v. Leilek District 55202220222022 Kyrgyzstan–Tajikistan clashes v. Kyrgyzstan–Tajikistan border140+20222022Al-Shabaab campaign in Ethiopia v. Somali Region900+20232023January 2023 Jenin incursion v. West Bank5+20232023February 2023 Nablus incursion v. West Bank11202320232023 Afghanistan–Iran border clash v. Afghanistan–Iran border3+20232023June 2023 Jenin incursion v. West Bank3+20232023July 2023 Jenin incursion v. West Bank13+20232023Las Anod conflict v. and Sool, Sanaag and Buhodle regions4000+202320232023 Nagorno-Karabakh conflict v. Nagorno-Karabakh300+20242026Afghanistan–Pakistan border conflict v. Durand Line80+202520252025 Cambodian–Thai border crisis v. Cambodia–Thailand border150+ Ongoing Start Finish Conflict Combatants Disputed Territory Fatalities2020OngoingWestern Saharan clashes v. Moroccan Western Sahara Wall15+2021OngoingArmenia–Azerbaijan border crisis v. Armenia–Azerbaijan border600+2022OngoingNorth Kosovo crisis v. and North Kosovo, Merdare border and Central Serbia42022OngoingFourth Taiwan Strait Crisis v. Taiwan Strait -2022OngoingRusso-Ukrainian war (2022–present) v. Ukraine and Russia2,000,000+2023OngoingIsraeli incursions in the West Bank during the Gaza war v. West Bank1,000+2023OngoingThird Lebanon War v. and Blue Line9,000+2023OngoingLebanon–Syria clashes (2024–present) v. and Lebanon–Syria border5+ 2024 Ongoing Israeli invasion of Syria (2024–present) v. Quneitra Governorate and Daraa governorates 100+
See also Border incident List of territorial disputes List of national border changes from 1815 to 1914 List of national border changes (1914–present)
References