Verified Answer :

  1. Germany's unrestricted submarine warfare 
    2. Americans supported the allies because of the cultural ties to Britain
    3. Sympathy for its fellow democracy

(1.) Germany's unrestricted submarine warfare
(2.) Americans supported the Allies because of cultural ties to Britain 
(3.) Sympathy for it's fellow democracy

I had this test a few days ago...
Hope it helped  :)

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