World War I(WWI), which was predominantly called the World War orThe Great Warfrom its occurrence until 1939 (World War II), and theFirst World Waror World War I thereafter, was a major war centred in Europe. It began on 28 July 1914 whenAustria-Hungarydeclared war againstSerbiaand lasted until 11 November 1918 after theGerman Empireand the Allies signed an armistice.
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