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Answer: German U-boat activity had forced the United States into the war.
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Answer:
In 1917, Germany, determined to win its war of attrition against the Allies, announced the resumption of unrestricted warfare in war-zone waters. Three days later, the United States broke diplomatic relations with Germany, and just hours after that the American liner Housatonic was sunk by a German U-boat.
Explanation:
The answer is D.
John brown was attacking kansas (bleeding kansas) because he did not like slavery
