The dominos begin to fall

This is the date in 1914 when Europe got the big shove that eventually costs millions of lives: Serbian activist Gavril Princip assassinated the Archduke Franz Ferdinand of Austria and killed his wife, Sophie.

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Archduke Franz Ferdinand and family. LOC

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Gavril Princip is arrested.

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Serbian civilians at an American Red Cross station in 1917. U.S. National Archives.