strict Islamic law. Afghanistan became a safe haven for many terrorist groups and when the twin towers were attacked in New York the United States and its coalition allies entered Afghanistan in large numbers and as Rory Stewart points to the history of Afghanistan, it is an easy country to enter but a difficult one to leave. References External links Documentary films about Afghanistan Documentary films about the War in Afghanistan (2001–2021) 2010s British documentary television series 2012 British television series debuts 2012 British television series endings BBC television documentaries about history during the 18th and 19th centuries BBC television documentaries about history during the 20th Century BBC television documentaries about history during the 21st Century