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Islamic State of Iraq - Wikipedia
ISIS - Leaders, Beheadings & Definition | HISTORY
ISIS Leader Killed: U.S. Evacuated 10 Civilians During Raid, …
ISIS acknowledges the death of its leader, announces his successor
The rise and fall of the Islamic State group: The long and short …
The Islamic State (Terrorist Organization) | RAND
As ISIS Resurges, US is Drawn Back Into the Fray - The New York Times
History of the Islamic State - Wikipedia
Islamic State in Iraq and the Levant - Encyclopedia Britannica
Where is ISIS today? : NPR