Question

Which of the following was a reason for the entrance of the United States into World War I?

A. The German use of unrestricted submarine warfare
B. The United States got pulled into the war through its alliance with France.
C. The United States wanted to ensure a new nation for the Polish people.
D. The German use of unrestricted tank warfare

Answer 1

A. Unrestricted Submarine Warfare.

This caused Germans to attack vessels that carried US citizens, bringing the US into the war.

Answer 2

A. The German use of unrestricted submarine warfare