he period of the Warring States (Zhanguo or Chan-Kuo) refers to the era of about 475 BCE to 221 BCE. It commenced at a time of when the numerous petty city-state kingdoms had been consolidated into about seven major contenders and a few minor enclaves. The above map shows a delineation of the area. The exact description of the states is subject to some uncertainty and the above map is based upon the map of the Warring …
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…previous eras the fighting was done by aristocrats in chariots. Chariots were not produced on a mass production basis so participation in the battles was limited to a small proportion of the population, the ruling elite of the city-states. But with the development of the casting of individual weapons there was a marked advantage to states with the economic resources to produce the weapons and the population to provide large armies to use these weapons.