Qin dynasty
Note: King Zhaoxiang of Qin (秦昭襄王) had already been ruling Qin for 51 years when Qin annihilated the Zhou dynasty; however the other six warring states were still independent regimes. Some Chinese historiographers thus used the next year (the 52nd year of King Zhaoxiang of Qin) as the official succession from the Zhou dynasty.
Wuchuan County, Inner Mongolia
Around 302BC, Wuchuan belonged to the State of Zhao (赵国), one of the Warring States. The king of Zhao defeated Hulinloufan and built a wall near Daqing Mountain to stop the advance of the northern tribes. This event was recorded in the "Water Jingzhu" (水经注). The wall is now called the South Daqing Mountain Great Wall. Wuchuan also plays a role in the history of the Qin Dynasty and the Han Dynasty, especially the Battle of Changping (长平之战) of Zhao Kuo (赵括). During this time, Wuchuan was controlled by the Xiongnu, a nomadic people famous for their bronzes and animal carvings. A Xiongnu dagger together with some knife-shaped coins from the State of Yan were unearthed at Tuchenzi Village, indicating that cultural exchanges between the Xiongnu and the Han Chinese were very extensive at that time. A total of more than 20 ancient tombs of the Qin and Han period have also been discovered in Wuchuan.