How has terrorism changed the world

How did these terror attacks change the world?
http://www.telegraph.co.uk/news/worldnews/islamic-state/11729063/How-did-these-terror-attacks-during-the-last-20-years-change-the-world.html

Twin Towers and terrorism: the impact 10 years on
http://www.theguardian.com/commentisfree/2011/sep/11/legacy-twin-towers-fukuyama-burke

How a decade of terror changed America
http://www.rand.org/blog/2009/12/how-a-decade-of-terror-changed-america.html

What impact did 9/11 have on the world?
http://www.theguardian.com/commentisfree/2011/sep/05/9-11-impact-world-al-qaida

9/11 terror attacks fuelled decade-long rise in racism in the UK
http://www.telegraph.co.uk/news/politics/10859770/911-terror-attacks-fuelled-decade-long-rise-in-racism-in-the-UK.html

How terrorism has changed air travel and security
http://abcnews.go.com/GMA/Weekend/terrorism-evolution-modern-airline-security-travel/story?id=9429016