The Zhou, Qin, and Han dynasties were three early dynasties in Chinese history. The Zhou dynasty established feudalism and saw technological advances like iron and silk production. It declined due to warring states fighting for power. The Qin dynasty united China under a centralized government with the first emperor, Qin Shihuangdi, who standardized laws and measurement. Notable constructions included the Great Wall and terracotta army. The Han dynasty expanded the empire through trade along the Silk Road and established a civil service system, but declined after the death of the emperor Wudi.