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This Day in American History

September 11

1 historic event on this date

Historical2001

September 11 Attacks

Terrorists hijacked four commercial airplanes, crashing two into the World Trade Center in New York City, one into the Pentagon, and one into a field in Shanksville, Pennsylvania after passengers fought back. Nearly 3,000 people were killed in the deadliest attack on American soil.

Why It Matters

The September 11 attacks transformed American foreign policy and civil liberties debates, leading to the Department of Homeland Security and ongoing discussions about the balance between security and freedom.

Explore the Principles Behind the History

Every event in American history connects to the founding principles. Discover the ideas that shaped these moments.

View the 28 Founding Principles