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World War I, also known as the Great War, started in 1914 after the assassination of Archduke Franz Ferdinand of Austria. His murder catapulted into a war across Europe that lasted until 1918. Learn the causes and consequences of First World War (1914-1918). Presented in simple language for quick understanding and fast revision. The First World War (1914-1919) The First World War started on 28 July 1914 with the assassination of the Austro-Hungarian crown prince, Archduke Franz Ferdinand, and ended with the Treaty of Versailles on 11 November 1918. Dates and Timeline of World War 1: The First World War or World War I which occurred between the dates 28 July 1914 and 11 November 1918 was a global struggle waged between two coalitions: the Allies and the Central Powers.