In a famous 1882 lecture at the Sorbonne, Ernest Renan highlighted a certain obligation to forget, even a necessity for historical error, in the formation of a nation. Renan constructed his argument on the basis of what he perceived to be a straightforward empirical contrast apparent in his day. On the one hand, the countries of Western and Southern Europe, such as France, England, Germany, Spain, and Italy, had successfully—if through different processes—established nations on the basis of carefully constructed and selectively forgotten historical pasts. The Ottoman Empire, on the other hand, encompassed an unwieldy motley of ethnic and religious groups, each maintaining separate historical identities. In effect, the empire was a state without an internally cohesive national body. Renan surely would have felt vindicated by the fact that three-and-a-half decades after his lecture the Ottoman Empire collapsed, and the various successor states that emerged in its wake justified their sovereignty by overtly defining mutually exclusive historical pasts for the nations they respectively claimed to represent. The project of institutionalized forgetting was a key element in one of the most spectacular transitions of political sovereignty in the twentieth century. The demise of the empire would yield the outlines of a new political geography. The map of the modern Middle East, North Africa, and southeastern Europe is the product of a world brought into being with the collapse of the Ottoman state. Across the region, anxieties about the salience of the Ottoman past have persistently emerged in ways that reveal the essentially unsettled character of modern political belonging. Territorial borders from the Balkans through the Middle East that were drawn up in the aftermath of imperial collapse were never permanently inscribed, often requiring powerful investments of military power to defend. Settler colonial expansion into Palestine and continued militant struggles over Kurdish political sovereignty attest to the ongoing instability of territorial arrangements organized within the past century. Equally important, the ideological and affective conditions of national identity, loyalty, and commitment that various states in the region promoted remain contested and often require repressive state interventions to sustain.