Which of the following events finally led the United States to enter World War I against Germany?

A. The sinking of the Lusitania
B. German reinstitution of unrestricted submarine warfare
C. The German invasion of Belgium
D. The Zimmerman Telegram



Answer :

Final answer:

Unrestricted submarine warfare, German reinstitution in 1917, and the Zimmerman Telegram led the US to enter World War I.


Explanation:

Unrestricted submarine warfare by Germany, German reinstitution of this policy in 1917, and the Zimmerman Telegram were the key events that led the United States to enter World War I against Germany.


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