How has the Islamic State of Iraq and the Levant (also known as IS, ISIS, or ISIL) managed to take over such a large swath of territory in the Middle East?
"Religious Extremism and Sectarian Violence: The Rise of ISIS,"
Ex-Patt Magazine: Vol. 3
, Article 2.
Available at: http://uknowledge.uky.edu/ex-patt/vol3/iss1/2