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Which of these was a factor in the U.S. entry in World War I?

A) the halt of the German army
B) the sinking of the Lusitania
C) the signing of a peace agreement
D) the death of the heir to the Italian throne

User Solendil
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B- Sinking of the Lusitania, Unrestricted submarine warfare by the Germans, and the Zimmerman Note- a note sent to Mexico by Germany, to attack to the United States
User Davemundo
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the answer is B hope this helped
User ChrisDekker
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