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==Intensification of Agriculture==
After the initial innovation of plant domestication in many parts of the globe between 12,000-5,000 years ago, the next major wave of development occurred in how plant domestication enabled large cities to develop. Initially, plant domestication and agriculture allowed towns and villages to flourish. However, with increased accumulation of agricultural resources by fewer individuals, cities encouraged greater labor migration to them so that people could work in the new economies that had agriculture at their core. This is evident in the place that first had cities, southern Mesopotamia, but also appears to be the case in the Indus and the New Word. In these cases, social inequality in wealth distribution was closely associated with the rise of cities. However, that wealth was based on unequal ownership of agricultural holding.<ref>For more on the origins of urbanism and how it was shaped by plant domestication, see: Bridge, G., & Watson, S. (Eds.). (2000). <i>A companion to the city.</i> Oxford, UK ; Malden, Mass: Blackwell.</ref>
Technologies also became more complex as the need to feed larger cities developed further after 5000 years ago. Large-scale irrigation networks, spanning hundreds of miles are found in the Old World, were required to intensify agriculture (Figure 2). These irrigation works not only required large labor forces, but they also required larger control of territory. One goal of now a new form of states, that is empires, was to control the food production process, where the control of water resources became key in some of the earliest empires from the 3rd millennium BCE to the 1st millennium BCE. Technologies, on the one hand, enabled larger populations to grow, but they also created new social problems, as they required new social adaptation to enable them. In the case of irrigation technologies, intense labor and upkeep of major irrigation works, including canals, qanats, and aqueducts, required an enormous amount of labor but also led to state control of these resources because of their enormous investment required. The power of governments over people's lives subsequently increased as agriculture and irrigation of domesticated plants became ingrained.