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Europe's Descent into War. First World War (1914-1918)Franz FerdinandTriple AllianceTriple EntenteRemember MAIN". American Neutrality. Wilson's Neutrality ProclamationWilliam Jennings Bryan. Submarine Warfare. Submarine WarfareUnterseeboot (U-boat)Lusitania (May 1915)Sussex pledge (1916) .
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