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Period: to
World War 1
Austria-Hungary's Archduke Francis Ferdinand assassinated while visiting Sarajevo, Bosnia -
Austria-Hungary's Archduke Francis Ferdinand assassinated while visiting Sarajevo, Bosnia
Austria-Hungary's Archduke Francis Ferdinand assassinated while visiting Sarajevo, Bosnia -
Germany declares war on Russia
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British ocean liner Lusitina sunk by German U-boat
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Trench Warfare
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U.S. joins war due to continued unrestriced sub warfare