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Why did the United States enter World War I?

美国为什么加入第一次世界大战？

官方列出的全部答案（3 个）All official answers (3)

Because Germany attacked U.S. (civilian) ships
To support the Allied Powers (England, France, Italy, and Russia)
To oppose the Central Powers (Germany, Austria-Hungary, the Ottoman Empire, and Bulgaria)

官方题目：移民局 M-1778 (09/25)，第 15 页Official question: USCIS M-1778 (09/25), page 15 移民局官方题目 PDFUSCIS official PDF