What happened when Shanxi moved south? Why does it move south?

The southward migration of the Jin Dynasty refers to the first southward migration of the Central Plains regime and civilization, from Luoyang, the capital of the Western Jin Dynasty, to Jiankang (now Nanjing). During the Western Jin Dynasty, a large-scale war continued in the Central Plains during the reign of Emperor Huaidi and Chennian, and the surrounding tribes established monarchies, which were powerful and threatened the Western Jin Dynasty, eventually leading to the disaster of Yongjia, and the court was threatened. During the reign of Jin Jianwu, Emperor Jin led the Han people in the Central Plains to cross the south from Luoyang, the capital city, which was called "Yongjia Rebellion, crossing the south with a crown", which was the first large-scale migration of the Han people in the Central Plains. After crossing the river in the Western Jin Dynasty, its capital was Jiankang (now Nanjing), which was called the Eastern Jin Dynasty in history. The gentry of the Han nationality and other subjects in the Central Plains fled south to each other, which is known in history as "Yongjia Rebellion, crowned Vietnam". Wang Dao relied on the northern gentry of Nandu to unite with Jiangdong strongmen to help Si Marui establish the Eastern Jin Dynasty.

The capital of the Jin Dynasty moved to Jiangdong Jiankang (now Nanjing), which was later called the Eastern Jin Dynasty.