Unification of China

The first emperor, Ying Zheng, unified writing and currency, built the Great Wall and the Terracotta Warriors (the eighth wonder of the world), and laid the foundation of China's territory. Construction of the Great Wall in the Middle Ages (220-1644 AD) The construction of the Great Wall in the Middle Ages witnessed the changes and development of China's historical period. During the Wei, Jin and Northern and Southern Dynasties, the reinforcement and modification of the Great Wall became an important engineering task to defend the national security of each dynasty. At the same time, the North and South Dynasties also repaired and maintained the Great Wall. The Great Wall gradually evolved into an important military defense line and played a great role. The large-scale construction of the Great Wall during the Ming Dynasty (1368-1644) In fact, most of the Great Walls we see nowadays were rebuilt during the Ming Dynasty.