'Back then, the US was responding to the 9/11 attacks on New York and Washington which killed nearly 3,000 people.
Officials identified Islamist militant group al-Qaeda, and its leader Osama Bin Laden, as responsible. Bin Laden was in Afghanistan, under the protection of the Taliban, the Islamists who had been in power since 1996.
When the Taliban refused to hand him over, the US intervened militarily, quickly removing the Taliban and vowing to support democracy and eliminate the terrorist threat.'
- Only a small point admittedly but the Taliban asked for evidence of Bin Laden's involvement. Never could work out why they didn't hand it over, they had loads of evidence.