Who did the United States fight in World War II?

Answers from the USCIS list

Give this answer.

• Japan, Germany, and Italy

Our explanation

World War II started in 1939 when Germany attacked Poland. Japan and Italy agreed to fight on Germany’s side. In 1941, Japan attacked the U.S. at Pearl Harbor, Hawaii. Then the U.S. fought all three countries.

Remember it

J-G-I, “Just Get It”: Japan, Germany, Italy.

Source

USCIS 2025 Study Guide (M-1175) p. 64: “World War II started when Germany attacked Poland.” “Japan and Italy agreed to fight on the same side as Germany.” “Japan attacked the United States at … Pearl Harbor.”

• Civics (History and Government) Questions for the Naturalization Test (2008 version), rev. 08/21 (PDF, USCIS)

Last checked on September 29, 2026.

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