The immediate cause of the entry of the United States into World War I was __________.
A
Assassination of Archduke Franz Ferdinand of Austria
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B
Announcement by Germany of the use of unrestricted submarine warfare
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C
Sinking of the Lusitania
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D
Zimmermann Note
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E
Attack on Pearl Harbor, Hawaii
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Solution
The correct option is B Announcement by Germany of the use of unrestricted submarine warfare Announcement by Germany of the use of unrestricted submarine warfare.