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More, from Sebastian Gorka, Defeating Jihad: The Winnable War.

Joby Warrick, Black Flags: The Rise of ISIS.

Also, Fawaz Gerges, ISIS: A History.

Patrick Cockburn, The Rise of Islamic State: ISIS and the New Sunni Revolution.

BONUS: Stephen Brooks and William Wohlforth, America Abroad: The United States' Global Role in the 21st Century.