multi-ethnic feudal state in Chinese history — the Qin Dynasty (221-206 B.C.). He called himself Qin Shi Huang or "First Emperor of Qin." He standardized the written script, weights and measures ...

Researchers believe that the joining of regional walls to create a single defensive structure against northern invasions occurred much later, in the Qin Dynasty, around the 3rd century BC.

multi-ethnic feudal state in Chinese history—the Qin Dynasty (221-207 B.C.). He called himself Qin Shi Huang or “First Emperor of Qin.” He standardized the written script, weights and ...