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X Which of these was a factor in the United States entrance in World War I?

X
A
B
C
the invasion of Poland
Japan's invasion of China
The Axis threat to the Panama Canal
D German unrestricted submarine warfare

User Indichimp
by
8.2k points

1 Answer

3 votes

D - German unrestricted submarine warfare.

User Jebeaudet
by
8.0k points
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