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The Great World War began on July 28, 1914.

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In May 1915, a German submarine sank the British ocean liner 'Lusitania' and led to Washington's entry into the Great War two years later.

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On December 18, 1916, the Battle of Verdun ended, the longest and bloodiest of the Great War, which pitted the French and Germans.

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In April 1917 there was a decisive change in hostilities: Germany brought the United States out of isolationism and placed it at the center of the conflict.

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The First World War ended on November 11, 1918 with the signing of the Armistice of Compiegne.