Question

Which was a major cause for the entry of the U.S. into World War I?
Responses
A Germany's invasion of BelgiumGermany's invasion of Belgium
B the desire to collect reparationsthe desire to collect reparations
C Russia's decision to leave the warRussia's decision to leave the war
D Germany's decision to resume unrestricted submarine warfare

Answers

GPT-4o mini
The major cause for the entry of the U.S. into World War I was:

**D) Germany's decision to resume unrestricted submarine warfare.**

This decision, particularly as it affected American ships and led to the sinking of the Lusitania and other vessels, was a key factor in turning public opinion against Germany and prompting the U.S. to enter the war in 1917.