The Caliphate Wars

(CLICK on each country to learn which extremist group dominates.) By declaring itself a caliphate, the Islamic State has presumed authority over Muslims worldwide. The group has found success recruiting individuals, but gaining the fealty of extremist groups around the world has proved harder. And it's now having to share the spotlight with the al-Qaida-linked Khorasan Group for notoriety. Content written by Elizabeth Arrott / Interactive created by Elizabeth Pfotzer