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Rise of Chinese Complex Societies and Climate
==Rise of Chinese Complex Societies and Climate==
During the long Neolithic period in China (from around 8500-2000 BC), as agriculture began to develop, different types of societies and food production practices formed that focused on millet, in western and central China, and rice, which became more common in central and eastern China. In central China, in particular, evidence indicates shift between millet and rice, where millet is a more hardy crop that can be cultivated in drier periods. In other provinces, there are shifts between rice cultivated in flood agriculture and mixture of using rice and millet. Both taste and climate-induced changes are likely co-occurring in the record, where communal and household-based strategies are also shifting in response to social and climate change that co-occurs. Many of these changes are apparent in central China because it is a region prone or more vulnerable to relatively minor shift in the climate. Until recent period, millet is seen as the food one can use in periods of stress and drought in China, although now in some quarters millet is a more fashionable food than rice.
Early Bronze Age China, at around 2200 BC, was characterised by widespread flooding according to legend. Yu the Great, a legendary ruler, was purported to help manage the great flooding that occurred at this time. There is climatic evidence that by the 4th millennium BCE and going into the 3rd millennium there were shifts to the monsoon rainfall patterns that agriculture would have become more dependent on. Winter monsoons began to wane in this period but less predictable rainfall patterns may have resulted, which could have led to greater instances of flooding where rainfall amounts would vary more greatly from season to season. Water management, at this time, began to utilise a series of earthworks, dams and other irrigation features that likely attempted to mitigate the uncertainty. Excess rainfall could be stored or forced into runoff to avoid catastrophic flooding. This likely helped areas such as along the Yellow River become more controllable and promote settlement. This has been suggested as helping to give rise to the increased social complexity seen at the end of the third millennium BCE and going into the early dynasties of the 2nd millennium BCE. Effectively climatic shifts could have promoted settlement and increased social complexity as societies adapted to better control and manage less predictable rains.

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