There isn't a "single" thing that gave rise to ISIS, it's a complex amalgamation of a lot of different things that led to this mess.<p>This is a documentary that only scratches the surface of this complex history but it's interesting altogether:<p>Adam Curtis - Bitter Lake: <a href="https://www.youtube.com/watch?v=nvyeWaVMDrI" rel="nofollow">https://www.youtube.com/watch?v=nvyeWaVMDrI</a>