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Why did the United States enter World War I?

美國為什麼加入第一次世界大戰？

官方列出的全部答案（3 個）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)

官方題目：移民局 M-1778 (09/25)，第 15 頁Official question: USCIS M-1778 (09/25), page 15 移民局官方題目 PDFUSCIS official PDF