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

Accepted 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

Explanation

On September 11, 2001, terrorists attacked the United States.

The explanation is our own study note, not official wording.

Source: USCIS, 2025 version (USCIS M-1778, 09/25)Verified Jul 23, 2026Official PDF

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