How was it formed during the Sixteen Kingdoms Period in the Eastern Jin Dynasty?

Xiongnu, Jie, Xianbei, Di and Qiang, who lived in the northeast, north and northwest of China, rebelled against the rule of the Western Jin Dynasty, resulting in a large number of China refugees involved in various teams. With the collapse of the Western Jin regime, the 16 countries established by Wuhu nobles rose in northern China. Si Marui (276 ~ 322), the vassal king of the Western Jin Dynasty, with the support of some relatives who went south with him and the southern gentry, established the Eastern Jin Dynasty, which stood side by side with the Wuhu regime in the north, and was known as the Sixteen Countries Period of the Eastern Jin Dynasty.