What major event happened on September 11, 2001 in the United States?

Answers from the USCIS list

Give one of these answers.

• Terrorists attacked the United States
• Terrorists took over two planes and crashed them into the World Trade Center in New York City
• Terrorists took over a plane and crashed into the Pentagon in Arlington, Virginia
• Terrorists took over a plane originally aimed at Washington, D.C., and crashed in a field in Pennsylvania

Our explanation

On September 11, 2001, terrorists attacked the United States. They took over four planes. Two crashed into the World Trade Center in New York City. One crashed into the Pentagon. One crashed in Pennsylvania. Almost 3,000 people died.

Remember it

9/11: four planes — two towers in New York, the Pentagon, a Pennsylvania field.

Source

USCIS 2025 Study Guide (One Nation, One People, M-1175) p. 67: “Terrorists hijacked four airplanes. Two airplanes crashed into the World Trade Center in New York City. One plane crashed into the Pentagon” … “Almost 3,000 people died”.

• 128 Civics Questions and Answers (2025 version), M-1778 (09/25) (PDF, USCIS)

Last checked on September 29, 2026.

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Easy to mix up with

• 116Name one U.S. military conflict after the September 11, 2001 attacks.