Because the dynasties before the Zhou Dynasty were all managed by the "gods" in the sky, and the emperor of the Zhou Dynasty was reincarnated by the "gods" in the sky, the Zhou Dynasty was directly reduced to the emperor.

To put it simply, the Shang Dynasty of the Zhou Dynasty was an agreement between the gods in the world and the gods in heaven. The gods of the human world were called to heaven, and the gods of heaven were reincarnated as the sons of heaven, which directly hindered mankind from continuing to be gods. There is no god in the human world, and naturally there is no god to interfere in state affairs.

The Zhou Dynasty advocated "respecting heaven and protecting people" and "the destiny is extraordinary, but the destiny is extraordinary". Shang is known as the son of heaven, but he thinks that he is the only "legal heir" of heaven. Shang Tang will not die in heaven, so he values kingship more than heaven. Since the Zhou Dynasty, it has been called Zhoutian Zi.

The king of Zhou was called the son of heaven. On the one hand, he was influenced by ancestor worship and theocracy of the previous generation. The source of power was deified, the ancestors were deified, and himself and his regime were deified accordingly. On the other hand, the king of Zhou is only the successor of the destiny, not the heaven itself. In this case, "the son of heaven" may be an ideal title: the son of heaven, governing the people on behalf of heaven.

Central system:

Zhou had great power over the vassals, who could still obey the tribute. In the thirteenth year of Zuo Zhuan, it was said: "In the past, emperors paid tribute in classes, while the emperors paid tribute in columns, and the weekly system was also established." In addition to gunnar, you need to make a pilgrimage to report on your work and send troops to sign it. The Emperor of Zhou had the right to interfere in the internal affairs of the vassal state, and sometimes sent envoys to the vassal state to supervise the state, which together with the vassal state was called "the vassal supervised the state".

During the Western Zhou Dynasty, the Emperor of Zhou was able to command the princes and enter the Eastern Zhou Dynasty. The authority of the Zhou royal family declined, and most governors failed to fulfill their obligations to the royal family. The royal family itself was attached to the great powers such as Jin, Zheng and Wei at that time, not to mention ordering the princes. The oath and the "pat on the shoulder" also made Zhou's only majesty lost.

But in name, the governors of various countries are still vassals of Zhou Wang. Except Chu, there was no act of usurping the throne. Putting forward that respecting the king and resisting foreigners is more for one's own national interests, but it also makes Zhou look up slightly. Most of the monarchs of the five tyrants also acted under this slogan, that is, they respected the king on the surface, but actually expanded and merged.

After entering the Warring States period, most countries have merged, and there are only more than 20 vassal States in the Zhou Dynasty, the largest of which is the Seven Heroes of the Warring States Period. During the Warring States Period, besides Wei Huiwang and Qi Weiwang, there was another move to the Zhou Dynasty, but it was also a show. The monarchs of other vassal states never laid hands on the Zhou Dynasty again.