6: World War I and its Aftermath
Striking steel mill workers holding bulletins in Chicago, Illinois, September 22, 1919. ExplorePAhistory.com
Thumbnail: The first page of the edition of the Domenica del Corriere, an Italian paper, with a drawing of Achille Beltrame depicting Gavrilo Princip killing Archduke Francis Ferdinand of Austria in Sarajevo. (Public Domain; via Wikipedia )