Why did the United States enter World War II?

Question 106 of 128 · Recent American History

Accepted answers

(Bombing of) Pearl Harbor
Japanese attacked Pearl Harbor
To support the Allied Powers (England, France, and Russia)
To oppose the Axis Powers (Germany, Italy, and Japan)

Explanation

The United States entered World War II after Japan bombed Pearl Harbor on December 7, 1941, joining the Allied Powers against the Axis Powers (Germany, Italy, Japan).

Source: USCIS 2025 Civics Test — 128 Questions and Answers (PDF).

Last verified against USCIS on 2026-08-25.