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The immediate cause of the United States's entrance into World War I was the

SAT · US History · previous-year question

  1. A.assassination of Archduke Franz Ferdinand of Austria.
  2. B.announcement by Germany of the use of unrestricted submarine warfare.
  3. C.sinking of the Lusitania.
  4. D.Zimmermann Note.
  5. E.attack on Pearl Harbor, Hawaii.

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