Which of these caused the United States to become involved in World War I?

Question

Responses
A the German invasion of Polandthe German invasion of Poland
B repeated violation of treaties by Japanrepeated violation of treaties by Japan
C enemy bombing of American military basesenemy bombing of American military bases
D threats to American security made by Germanythreats to American security made by Germany

Answer 1

The correct response is:

D threats to American security made by Germany.

The United States became involved in World War I primarily due to German unrestricted submarine warfare, which posed a direct threat to American ships and citizens, as well as other provocations such as the interception of the Zimmermann Telegram, in which Germany sought a military alliance with Mexico against the United States.