[Why] The Western Zhou capital Haojing was reduced to scorched earth by the Quanrong, and the surviving royal demesne stood exposed to repeated steppe raids. The newly installed King Ping could no longer hold the central plains in Guanzhong. [What] Under the armed escort of the lords of Jin, Zheng, and Qin, King Ping decisively moved the capital east to Luoyi, a safer geopolitical seat. This launched the Eastern Zhou and the Spring and Autumn period of Chinese history. [Who] King Ping was a defenseless son of heaven dependent on the lords for survival. The meritorious Lord Xiang of Qin received fief land and formal statehood, while the lords of Jin and Zheng expanded their power. [How] The migration marked the de facto end of the Zhou king's status as universal sovereign, with the royal demesne dramatically shrunken. The decline of royal power dismantled the unified state and opened the multipolar age of contending lords.
Why
The historic event of King Ping's Eastward Migration represents a key developmental peak of the Huaxia dynastic system. The decline of royal authority and the beginning of multi-state competition. By establishing this moral or administrative benchmark, it continues to shape the structural and philosophical fabric of ancient Chinese statecraft.