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World war - Wikipedia
World War I | History, Summary, Causes, Combatants, Casualties, …
World War II | Facts, Summary, History, Dates, Combatants,
World War I: Summary, Causes & Facts - HISTORY
World War I - Wikipedia
World War II - Wikipedia
World War I: Causes and Timeline - HISTORY
World War I 1914-1918 - Encyclopedia Britannica
BBC - History: World Wars in-depth
World War I facts and information - National Geographic