Qin Dynasty unites China, creating the world’s first centralized empire
In 221 B.C.E., a young king named Ying Zheng finished off the last of six rival states and declared himself China’s first emperor. He standardized the written script, coinage, and cart axles so roads could carry a single empire’s traffic. The Qin Dynasty lasted just 15 years, but its template for a unified China shaped the civilization for over two millennia.









