Question 101 of 128

Why did the United States enter World War I?

Official USCIS 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)

Why this is the answer

The United States entered World War I in 1917 after German submarines attacked American and other civilian ships. The U.S. also had close ties to the Allied Powers and wanted to oppose the Central Powers.

💡 Memory tip: Remember: German submarines + Allied ties = U.S. entry in 1917.

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More from Recent American History and Other Important Historical Information

100. Name one war fought by the United States in the 1900s.
102. When did all women get the right to vote?
103. What was the Great Depression?
104. When did the Great Depression start?
105. Who was president during the Great Depression and World War II?
106. Why did the United States enter World War II?

Source: USCIS, 128 Civics Questions and Answers (2025 version), M-1778.