Which event started World War I? O A. the sinking of the Lusitania by German U-boats
OB. the assassination of Archduke Franz Ferdinand and his wife, Sophie
OC. Germany's annexation of Alsace and Lorraine after the Franco-Prussian War
D.
the Russian enforcement of Pan-Slavism throughout Slavic nations
E.
the signing of treaties in 1839 and 1867 to protect Belgium's neutrality
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Home » History » Which event started World War I? O A. the sinking of the Lusitania by German U-boats OB. the assassination of Archduke Franz Ferdinand and his wife, Sophie OC. Germany's annexation of Alsace and Lorraine after the Franco-Prussian War D.