Briefly describe the purpose, content and function of the Western Zhou Dynasty enfeoffment system.

The enfeoffment system was the political system of the Western Zhou Dynasty. From the purpose, it is to consolidate the state power of slavery. From the specific practice, the king of Zhou enfeoffed the former royal family, heroes and nobles to become princes and established vassal States. In essence, the enfeoffment system, as a national system, belongs to the superstructure, mainly to solve the internal contradictions of the ruling class. The main contradiction in slave society is the contradiction between slave owners and slaves, and the contradictions within the slave owners' class are secondary contradictions, but the secondary contradictions sometimes dominate. As the superstructure of China's slave society, the enfeoffment system was built on the economic basis of Jingtian system. The significance of implementing the enfeoffment system lies in: (1) summing up historical experience and organically combining the establishment of local political power with the consolidation of one's own rule. In the process of enfeoffment, the Zhou Dynasty formulated a series of systems to enable the royal family to effectively control the whole territory. (2) The system of enfeoffment made the unified social system universally implemented in vassal states. The Zhou royal family used the provisions of rights and obligations to make Zhou a veritable vassal king, which changed the situation that Wang was a vassal in Xia and Shang Dynasties. (3) The enfeoffment system promoted the rapid development of the social history of the vassal States, and unified slavery was established and developed in the vassal States, which made the slave economy have a prosperous foundation. (4) The enfeoffment system accelerated the process of national integration. The remote vassal States that were enfeoffed gradually accepted the culture of the Central Plains, and some big governors continued to use troops against the surrounding ethnic minorities such as Yi, Rong and Di, and then annexed their land for cultural infiltration.