ISIS used to be al-Qaeda in Iraq
ISIS wants to establish a caliphate
The conflict between Iraqi Sunnis and Shias sustains ISIS
Iraq’s former prime minister made the ISIS problem worse
ISIS has claimed responsibility for the Paris attack
ISIS also holds a huge amount of territory in Syria
ISIS funds itself through oil and an extortion racket
The global oil market was spooked by ISIS's initial advance, but now the effect is minimal
The conflict was a boon to Iraq's Kurds — at first
Dangerous Shia militias are playing a huge role in the conflict
ISIS has made significant territorial gains in Iraq, but it's being pushed back
Iraqi forces are much stronger than ISIS, but the Iraqi army is kind of a mess
Iran is fighting on the Iraqi government’s side
The US and Iran are tacitly cooperating in Iraq
The US is waging a campaign to destroy ISIS
Some Americans blame Obama for ISIS's growth
Iraq's Sunnis and minorities will probably suffer the most
ISIS captured and executed James Foley and Steven Sotloff, two American journalists