Why did the United States enter World War I?

Accepted answers

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)

Explanation

The U.S. entered WWI after Germany attacked U.S. ships and to support the Allied Powers.

The explanation is our own study note, not official wording.

Source: USCIS, 2025 version (USCIS M-1778, 09/25)Verified Jul 23, 2026Official PDF

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