The correct answer is C. Germany's resumption of unrestricted submarine warfare. This policy, announced in early 1917, led to the sinking of American ships and ultimately played a significant role in prompting the United States to declare war on Germany later that year.
Which of the following finally caused the United States to declare war on Germany in 1917?
A. Sinking of the Lusitania
B. Germany's declaration of the Sussex Pledge
C. Germany's resumption of unrestricted submarine warfare
D. Germany's invasion of neutral Belgium
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