World War I (ProtoTimeline)
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World War I (WW-I) was a global war centered in Europe that began on July 28, 1914 and lasted until November 3, 1918. It was predominantly called the World War or the Great War from its occurrence until the start of World War II in 1939, and the First World War or World War I thereafter. It involved all the world's great powers, which were assembled in two opposing alliances: