Why did the United States enter World War II? — Answer & Explanation

Official Question & Answer

Question

Why did the United States enter World War II?

✦ OFFICIAL ANSWER ✦

(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)

Why This Is the Answer

The United States entered World War II because of the bombing of Pearl Harbor. On December 7, 1941, Japan launched a surprise attack on the U.S. naval base at Pearl Harbor, Hawaii.

The attack killed over 2,400 Americans and destroyed much of the Pacific Fleet. President Roosevelt called it 'a date which will live in infamy.' Congress declared war on Japan the next day, and Germany and Italy declared war on the U.S. shortly after.

The U.S. fought against the Axis Powers (Germany, Italy, and Japan) alongside the Allied Powers (England, France, and Russia). The war ended in 1945 with Allied victory.

💡 Interview Tip

Say: 'The bombing of Pearl Harbor' or 'Japan attacked Pearl Harbor.'

Study These Questions Next

What U.S. war ended slavery?

American History

What amendment says all persons born or naturalized in the United States, and subject to the jurisdiction thereof, are U.S. citizens?

American History

When did all men get the right to vote?

American History

Name one leader of the women's rights movement in the 1800s.

American History

Ready to Master All the Civics Questions?

Test yourself with our free quiz simulator and interactive flashcards — the same official questions, timed like the real interview.

✅ Start Free Quiz 🃏 Study Flashcards