Besides the discovery of the Zimmerman telegram encouraging Mexico to declare war on the United States, what other reason is given for the United States joining World War I?

Question

Responses
A Unrestricted submarine warfareUnrestricted submarine warfare
B Fears of the spread of communismFears of the spread of communism
C Assassination of Archduke FerdinandAssassination of Archduke Ferdinand
D Alliance with France and Great Britain

Answer 1

The correct answer is A Unrestricted submarine warfare. This was a significant factor in the United States' decision to enter World War I, particularly due to Germany's policy of sinking ships without warning, which resulted in American casualties and the loss of American ships.