The September 11 terrorist attacks exposed what new feature of terrorism?

Question

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The September 11 terrorist attacks showed that terrorists were seeking not only to coerce changes in enemies' policies but also to kill many people, as evidenced by the high number of casualties from the attacks. While terrorists may also seek to spread their religious or political messages, the primary feature that was exposed by the attacks was the willingness to kill large numbers of people to achieve their objectives.

The September 11 Terrorist Attacks Exposed What New Feature of Terrorism