The Sumerians and Regional Interdependence
With the emergence of the Sumerian civilization in about 3100 B.C., a new era in human experience began-one in which the economic, political, and social mechanisms created by humans began to affect the lives of cities, towns, and villages located hundreds and perhaps thousands of miles apart. In a real sense, a rapidly evolving world system linked hundreds of Southwest Asian societies all the way from modern-day eastern Iran to the eastern Mediterranean and the Nile Valley. This nascent world system developed as a result of insatiable demands for nonlocal raw materials in different ecological regions where societies were developing along very similar evolutionary tracks toward greater complexity. In each area, social developments and technological innovations were triggered not only by basic economic needs but also by the competitive instincts of newly urbanized elites, who used lavish display and exotic luxuries to reaffirm their social prestige and authority. Sumerian civilization is a mirror of this developing regional interdependence.
Sumerian civilization came into being as a result of a combination of environmental and social factors The Sumerians lived in a treeless, lowland environment with fertile soils but no metal little timber, and no semiprecious stones. They obtained these commodities by trading with areas where such items were in abundance. Sumerian rulers controlled not only large grain surpluses that could be moved in river craft but also a flourishing industry in textiles and other luxuries. The trade moved up and down the great rivers, especially the placid Euphrates. Ancient overland trade routes linked the Tigris and Euphrates rivers with the distant cities and ports in the Levant (eastern Mediterranean area). Even as early as Sumerian times, caravans of pack animals joined Anatolia to the Euphrates, the Levant to Mesopotamia, and Mesopotamia to isolated towns on the distant Iranian highlands to the east.
Bronze technology produced tougher-edged, more durable artifacts that could be used for more arduous day-to-day tasks. One resulting innovation was the metal- and wood-tipped plow, an implement dragged by oxen that was capable of digging a far deeper furrow than the simple hoes and digging sticks of earlier times. The plow was developed as irrigation agriculture assumed greater importance in Sumer, and the combined innovations increased agricultural yields dramatically. These yields not only supported larger urban and rural populations but also provided a means for the rulers of city-states both in Sumer and farther afield to exercise more control over food surpluses and over the wealth obtained by long-distance exchange.
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