Twenty-five years ago, the worst terrorist attacks ever in the United States killed 2,977 people from 90 nationalities, including five Portuguese. The attacks consisted of four planes hijacked by 19 hijackers linked to Al-Qaeda.
The planes crashed into the Twin Towers in New York, the Pentagon in Washington, and a field in Pennsylvania. This was the largest terrorist attack ever carried out against the United States.
The article presents 11 numbers to understand September 11 and the War on Terror that followed these attacks. The analysis seeks to contextualize the scale of the attack and its consequences.
