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World War I (often abbreviated as WWI or WW1), also known as the First World War or the Great War, was a global war originating in Europe that lasted from 28 July 1914 to 11 November 1918. ... In response, on 23 July, Austria-Hungary issued an ultimatum to Serbia.
End date: 11 November 1918
Start date: 28 July 1914
Combatants: German Empire, Kingdom of Roman
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