Archduke Ferdinand
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The assassination of Archduke Franz Ferdinand caused World War I. This took place in 1914.
world war 2
June 28, 1914.
The war is generally accepted to have begun on 1 September 1939, with the invasion of Poland Slovakia
World War I had many causes, but the primary cause was the assasination of Archduke Franz Ferdinand of Austria while in Sarejevo on June 28, 1914.