The Endgame in Iraq - New York Times

As has been the case from the beginning of the wars in Iraq and the previous war between Iraq and Iran, the struggle among the Muslim sects was at the root of Saddam's stronghold in Iraq and the present insurgency/terrorist chaos. The Sunnis hate the Shiites and the Arab world is mostly Sunni, except in Iraq and Iran. The situation is complicated by the fact that they all have oil and we in the West, and now in China and India, need it.