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World War I (1914–1918) – Full Details World War I (WW1), also called the First World War or The Great War, was one of the largest and most destructive wars in history. It lasted from 28 July 1914 to 11 November 1918 and involved many of the world's major powers. 1. Causes of World War I Several political and social factors caused WW1. Historians often summarize them with the word MAIN: 1. Militarism Countries built powerful armies and navies and were ready for war. Example: Germany and Britain