Under Qin Shi Huang, general Meng Tian connects and extends northern walls as a defence against the Xiongnu.
Approximate date.
The first emperor of unified China dies while on tour; the Qin dynasty collapses within a few years.
The state of Qin conquers its rivals, ending the Warring States period; Ying Zheng proclaims himself the First Emperor.
After defeating Xiang Yu, Liu Bang becomes Emperor Gaozu of Han, opening a dynasty that lasts over four centuries.
Zhao Tuo, king of Nanyue, conquers Âu Lạc and incorporates it into Nanyue; traditionally dated to 179 BCE.
Emperor Wu of Han sends Zhang Qian to Central Asia, a journey that opens the way for Silk Road trade.
The Han dynasty conquers Nanyue in 111 BCE and establishes the commanderies of Jiaozhi, Jiuzhen and Rinan, beginning a long period of Chinese rule.