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The War on Terror - Timeline & Facts | HISTORY
War on terrorism | Summary & Facts | Britannica
War on terror - Wikipedia
After 9/11, The World Changed. The Fight Against Terrorism Has Too - NPR
How Has the Terrorism Threat Changed Twenty Years After 9/11?
A New Era of Conflict and Violence | United Nations
A Generation After The 9/11 Attacks, A Look Back On The War On Terror - NPR
20 Years On, the War on Terror Grinds Along, With No End in Sight
Will the 'War on Terror' ever end? - BBC
Terrorism - Our World in Data