9/11: 20 Years Later

20 years ago today, terrorism changed the United States forever. Nearly 3,000 people were killed in the attacks on September 11, 2001.

The attacks remain as the deadliest foreign violence on US soil.

19 men hijacked four commercial planes and crashed them into both World Trade Center Towers in New York, the Pentagon and a field in Pennsylvania.

The attacks plunged the United States into a 20-year war in Afghanistan that came to an end last week.