When Yao, Shun and Yu were alive, the tribal alliance adopted the method of "abdication" to "choose the best and appoint the best" and elected the world leader. Yao was old and gave the position of "king" to the sage Shun. Shun was old and gave the position of "king" to Yu, who was old and passed it on to his son Qi.
Yu is the leader of the Xia tribe alliance in the Central Plains. After he became the "Lord of * * *" in the world, he established an army, conquered the three southern Miao people, built a city, and formulated a criminal law, thus establishing the first slave country in China's history-the Xia Dynasty.