What happened to the "Wen fen" of the Zhou Dynasty?

The enfeoffment within China refers to the feudal system in the pre-Qin period, also known as the enfeoffment system. In ancient China, it was often said that "the country was founded", "the land was divided into two parts" and "the vassal enfeoffment". Because the feudal system of the Zhou Dynasty lasted for 800 years, and the Zhou Dynasty was also the heyday of the Central Plains culture in 800 years, the cultural imprint produced by the feudal social system has continued to this day. The emperor of Zhou Dynasty divided the world into clan children and heroes, and gave them corresponding titles at the same time. The titles are divided into public, uncle, Hou, Zi, and public five. The population and ownership of the fenced land are hereditary, that is, as private property, they can be passed down from generation to generation, from son to grandson. These nobles with titles are generally called "princes", among which those with the same clan (surname) as the son of heaven are called "princes" and those with different clans (surnames) are called "liehou". In the fief, the Lord can have an independent judicial system and military armed forces, and the military scale can be divided into "a hundred times the country" and "a thousand times the country" according to the etiquette system. In the Zhou Dynasty, the effective implementation of the feudal system enabled the developed Central Plains culture to spread effectively throughout the country, improved the national economic and cultural level, made Chinese civilization far ahead of neighboring countries, and successfully integrated the minority areas such as Qi, Chu, Yan, Wu and Yue into Chinese civilization.