In the Zhou dynasty, the king was the most valuable, and the son of heaven was the king. According to the blood relationship with the royal family, the contributions of the princes are divided into five categories: public, Hou, Bo, Zi and Gong. Therefore, any vassal state that claims to be king is equal to Zhou in theory, but everyone respects the Zhou royal family and still calls Zhou. When the Emperor of Zhou died, Qin gained all the rights of the Zhou royal family, but the six countries still believed that Qin was a vassal state, not an emperor.
Chu was originally a viscount country, but in 704 BC, it became king by itself, and Xiong Tong, the monarch, called himself Chu Wuwang. In 344 BC, Wei and Qi were both kings and recognized each other as kingdoms. In 325 BC, when he became king, Qin was promoted from earl to baron. In 323 BC, Han, Zhao, Yan and Zhongshan successively became kings. In 3 18 BC, the state of song was also king. When the Qin dynasty was destroyed, most of the governors in the world were kings, and everyone was kings. Naturally, they will not recognize the identity of Qin Shihuang.
In 230 BC, the King of Qin launched a war of subjugation, and it took ten years to wipe out the six countries one by one, leaving only one country in name only. These seven countries belong to one country. At this time, there is no need for everyone to recognize Qin's identity as the co-owner of the world. Therefore, when the Qin dynasty called Wang Zheng emperor, the Qin dynasty was formally established. From 256 BC to 22 BC1year, not counting dynasties, history books call it the Warring States Period. In the era of the war at the end of the Qin Dynasty and the struggle between Chu and Han, the Han empire did not represent orthodoxy, and it was still a Han country. After the Han Dynasty destroyed Chu, the national color of Wang Han became the Han Dynasty.