Created by European powers, the nation of Iraq may be buckling under the pressure of trying to unite three distinct ethnic groups.

When Serbian nationalists conspired to assassinate the Archduke Franz Ferdinand and his wife in Sarajevo on June 28, 1914, they lit the fuse that would, six weeks later, explode into World War I. The fallout from those murders, and the ghastly legacy of the entire war, extend far beyond the time frame of the late 1910s. Nor were they limited to Europe; the war's effects are as fresh as the grisly stories and images coming out of Iraq today.

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.

Read Scott Anderson's article on Smithsonian.com