| http://www.w3.org/ns/prov#value | - What problems did this cause? . ??? ??? ??? What is a U-Boat? a fleet of submarines that attcks a neutral shipping raise a storm of protest. ??? ??? ??? What was Germany's warning to the United States and other neutral nations? . ??? ??? ??? What was President Wilson's warning to Germany? . ??? ??? ??? What happened on May 7, 1915? . ??? ??? ??? What was the Sussex Pledge? .
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