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Military conflict took place during every year of the 20th Century. There were only short periods of time that the world was free of war. The total number of deaths caused by war during the 20th Century has been estimated at 187 million and is probably higher.
The following list includes some of the wars fought by the armed forces of the United Kingdom, the British Empire and the British Commonwealth since 1900.
The Second Anglo-Boer War, 1899–1902
The First World War, 1914–1918
The Russian Civil War, 1917–1922
The Irish War of Independence, 1919–1921
The Irish Civil War, 1922–1923
The Second World War, 1939–1945
The Korean War, 1950–1953
The Kenya Emergency, 1952–1960
The Suez Crisis, 1956
The Malayan Emergency, 1948–1960
The Aden Emergency, 1963–1967
The Troubles, 1968–1998
The Falklands War, 1982
The Gulf War, 1990–1991
The Bosnian War, 1992–1995
The Kosovo War, 1998–1999
The Global War on Terrorism, 2001–2013
The War in Afghanistan, 2001–2014
The Iraq War and Insurgency, 2003–2011