 Complete the following phrase:  The Zhou dynasty c. 1050256 BCE had made the State of Qin in Western China as an outpost to breed horses and act as a defensive buffer against nomadic armies of the Rong, Qiang, and Di peoples. After conquering six Warring States i.e. Han, Zhao, Wei, Chu, Yan, and Qi by 221 BCE, the King of Qin, Ying Zheng, 