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

Question

Responses
A the halt of the German armythe halt of the German army
B the sinking of the Lusitaniathe sinking of the Lusitania
C the signing of a peace agreementthe signing of a peace agreement
D the death of the heir to the Italian thronethe death of the heir to the Italian throne

Answer 1

B. the sinking of the Lusitania

The sinking of the Lusitania in 1915, a British ocean liner by a German U-boat, was a significant factor that contributed to the U.S. entry into World War I. The event, along with other factors such as unrestricted submarine warfare by Germany and the Zimmerman Telegram, helped shift public opinion in the U.S. in favor of joining the conflict.