Here are two (rather academic) lectures on the genesis and origin and nature of the Islamic State, aka ISIS, aka ISIL, aka Daesh (good grief). The last of which is especially stupid for Americans to use because in Arabic it simply stands for Dawl Islamiyya fi Iraq war Sham, which is Islamic State in Iraq and Syria. Duh.
But take the time to watch both lectures. Note that you need to click on Del 2 at the bottom of the screen, not Del 1. Not sure why Del 1 is even there...but it is.
In any case, watch and learn: