<span>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.</span>
Freed slaves who wanted land available under the homestead act still faced the challenge of intense racism and segregation--meaning that they faced persecution and violence from whites who were in competition over the land.
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Answer: cold, pneumonia, harsh winters
Explanation: