One factor that contributed to the U.S.'s decision to get involved in World War I and help the Allied powers was

Question

Responses
A Japan invading the U.S. naval base in Pearl Harbor.Japan invading the U.S. naval base in Pearl Harbor.
B France surrendering to Germany after repeated air bombing.France surrendering to Germany after repeated air bombing.
C Russia exiting the war and signing a peace treaty with Germany.Russia exiting the war and signing a peace treaty with Germany.
D Germany's attack on England and installing a "puppet" government

Answer 1

The correct answer is:

C. Russia exiting the war and signing a peace treaty with Germany.

This development was significant because it allowed Germany to concentrate its forces on the Western Front, presenting a greater threat to the Allied powers, including France and Britain. The situation heightened concerns in the U.S. about the balance of power in Europe, influencing the decision to support the Allies against Germany.