Question

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Question
Which of these was a factor in the United States entrance in World War I?
Responses
A the invasion of Polandthe invasion of Poland
B Japan's invasion of ChinaJapan's invasion of China
C The Axis threat to the Panama CanalThe Axis threat to the Panama Canal
D German unrestricted submarine warfareGerman unrestricted submarine warfare

Answer 1

The correct response is:

D. German unrestricted submarine warfare

This was a significant factor in the United States' decision to enter World War I, particularly after incidents like the sinking of the Lusitania in 1915.