The entry of the United States into World War I on the side of the Allies was due to several factors; among them were the resumption of unrestricted submarine warfare by the Germans and:
A) the genocide attempted by the Germans on the Eastern Front against the Slavs.
B) the enormous debt owed U.S. banks by the Allies that needed to be protected.
C) the discovery of a widespread and powerful German "fifth rank" in the United States.
D) the victory of the Bolsheviks in Russia and the movement of German troops to the Western Front.
E) the interception of the "Zimmerman telegram" sent by Germany's foreign minister to Mexico.

Question

Quizplus · Accepted Answer

The interception of the "Zimmerman telegram" sent by Germany's foreign minister to Mexico was a major factor in the United States' decision to enter World War I. The telegram proposed that Mexico ally with Germany in exchange for assistance in regaining territories lost to the United States, which alarmed and outraged the American public. This incident, combined with the resumption of unrestricted submarine warfare by the Germans, ultimately led to the United States declaring war on Germany and joining the Allies.

The Entry of the United States into World War I