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Allied powers, Germany, The ongoing blockade of German foreign supply…

- - - - Battle of Jutland
        
        1917 Britain and United States increasing the production of warships
        
        Lusilania 1000 American casualties united States entering War against Germany
- - - - Germany's initiation of U Boat attacks on the allies
        
        February 1915 Germans began a campaign of unrestricted submarine warfare.
        
        Attack on Linear Lusilania
        
        German calling off unrestricted submarine campaign
        
        1916 reinitiation of unrestricted submarine of warfare