Why did the Xia Dynasty build a new castle in Chengziya, Longshan Town, Zhangqiu, Shandong Province?

Longshan Town, Zhangqiu, Shandong Province is located in Dongyi people's activity area, which was obviously built by Dongyi people's tribal consortium. At that time, there were many chiefdoms or tribal alliances in Dongyi, such as the poor, Shang and Yi nationalities. As early as Yu, Dongyi refused to obey Yu's orders. After the extermination began, the contradiction between Xia Dynasty and Dongyi became more acute. After Qi's death, his son Taikang succeeded to the throne, and the event of "Taikang's loss of the country" occurred. There was a poor leader in Dongyi, Hou Yi, who once seized the rule of Xia Dynasty. It was not until "Shao Kang Zhongxing" destroyed the poor families that the rule of Xia Dynasty was restored and consolidated. The new castle in Chengziya may have been rebuilt in the past few decades because of the need of war.