Sources
https://www.statista.com/topics/2267/terrorism/
https://www.globalpolicy.org/war-on-terrorism.html
https://www.aljazeera.com/news/2017/08/2001-2017-intervention-afghanistan-170822035036797.html
http://wjla.com/news/nation-world/year-in-review-major-events-in-the-war-on-terror