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Terrorism | Definition, History, & Facts | Britannica
Terrorism - Wikipedia
Terrorism — FBI
After 9/11, The World Changed. The Fight Against Terrorism Has Too - NPR
Terrorism - Our World in Data
The Escalating Terrorism Problem in the United States - CSIS
Terrorism | RAND
FACT SHEET: National Strategy for Countering Domestic Terrorism
National Terrorism Advisory System | Homeland Security
Security Council examines rising terrorism threat globally