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"ISIL is not 'Islamic' ... and ISIL is certainly not a state," said President Obama in a September 2014 speech about the terrorist organization commonly referred to as Islamic State. The self-proclaimed caliphate has been called many names. Here is a primer on the terminology, drawn from our latest Brookings Essay, "The Believer," by Will McCants on the rise of Islamic State leader Abu Bakr al-Baghdadi.