World War I started in 1914. It directly started because of the assassination of archduke Franz Ferdinand and his wife on June 28, 1914. This war started because of a number of alliances that caused nations to declare war on each other.
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July 28, 1914
the treaty of Versailles
World War One was from nineteen fourteen to nineteen eighteen. World War Two was around from the nineteen thirties to the fifties, depending on definitions of start and end dates.
Europe
Africa has never had a 'World War' at all.