"For nearly 400 years prior to World War I, the lands of Iraq existed as three distinct semi-autonomous provinces, or vilayets, within the Ottoman Empire. In each of these vilayets, one of the three religious or ethnic groups that predominated in the region – Shiite, Sunni and Kurd – held sway, with the veneer of Ottoman rule resting atop a complex network of local clan and tribal alliances. This delicate system was undone by the West, and for an all-too-predictable reason: oil."