Economic Developments
The Warring States Period saw the proliferation of iron working in China, replacing bronze as the dominant type of metal used in warfare. Areas such as Shu (present-day Sichuan) and Yue (present-day Zhejiang) were also brought into the Chinese cultural sphere during this time. Trade also became important, and some merchants had considerable power in politics, the most prominent of which was Lü Buwei, who rose to become Chancellor of Qin and was a key supporter of the eventual Qin Shihuang.
At the same time, the increased resources of consolidated, bureaucratic states, coupled with the logistical needs of mass levies and large-scale warfare, led to the proliferation of economic projects such as large-scale waterworks. Major examples of such waterworks include the Dujiangyan Irrigation System, which controlled the Min River in Sichuan and turned the former backwater region into a major Qin logistical base, and the Zhengguo Canal which irrigated large areas of land in the Guanzhong Plain, again increasing Qin's agricultural output.
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