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  • The Sinking of Lusitania
  • Unrestricted Submarine Warfare
  • Sussex Pledge
  • Germany waged submarine warfare against the United Kingdom of Great Britain and Ireland. The ship was identified and torpedoed by the German U-boat U-20
  • Unrestricted submarine warfare is a type of naval warfare in which submarines sink vessels such as freighters and tankers without warning
  • Zimmerman Note
  • Mexico will help us in case of war with the US.
  • In this statement, Germany said they would temporarily stop these attacks but might have to resume in the future if the British continued to blockade German ports.
  • US Enters World War I
  • In it Zimmermann said that in the event of war with the United States, Mexico should be asked to enter the war as a German ally.
  • U-Boats, sinking of merchant ships, because u.s. economy was based on selling war supplies...
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