Let me briefly talk about how the Jin Dynasty developed into the Sui Dynasty.

The western Jin dynasty unified the three kingdoms, and then there was a wave of civil strife and the chaos of the eight kings. In order to fight for power and profit, the governors did not hesitate to introduce northern aliens as foreign aid, which led to the invasion of the Central Plains by aliens for the sake of the Five Chaos. Jin was forced to move south, and was later called the Eastern Jin Dynasty. The north is occupied by ethnic minorities, and the separatist forces of various ethnic groups are complex, each claiming the emperor and fighting around. Historically known as sixteen countries (in fact, more than sixteen regimes).

In 420, Emperor Wu of the South stood on his own feet, replacing the Jin Dynasty and establishing Liu and Song Dynasties, followed by Song, Qi, Liang and Chen Dynasties. The northern Xianbei people finally overthrew several other minority regimes and established the Northern Wei Dynasty. The Northern Wei Dynasty was later divided into the Eastern Wei Dynasty and the Western Wei Dynasty, which were replaced by the Northern Qi Dynasty and the Northern Zhou Dynasty respectively. These northern and southern regimes are collectively called the Northern and Southern Dynasties.

Later, the Northern Zhou Dynasty destroyed the Northern Qi and basically pacified the North. However, there was a bad king, which led to the great influence of Emperor Wen of Sui Dynasty. Later, Emperor Wendi of Sui Dynasty proclaimed himself emperor to replace the Northern Zhou Dynasty and established the Great Sui Dynasty. Later, the Southern Expedition wiped out Chen Nan, the last dynasty in the Southern Dynasties. So far, since the Western Jin Dynasty, the north and the south have been reunified again, ending nearly 300 years of division.