How did the four counties in Hexi gradually become five cities in Hexi from the hometown of Xiongnu to the land of Han family?

Because the prosperity of the Han Dynasty at that time dealt a heavy blow to the development planning of the Huns and later generations. In the pre-Qin period, the more people came here, the stronger their strength became after nomadic people such as Gourong and Beiqiang grazed in Hexi Corridor. Da Yueshi was right. Later, the Xiongnu in the north invaded here, and it became the position of Xiongnu, which became more and more prosperous under the leadership of Xiongnu at that time. When fighting the Han Dynasty, he led the Xiongnu to defeat the Han nationality.

The national strength of the Han Dynasty under the leadership of Emperor Wudi became stronger and stronger, so in A.D. 133, Emperor Wudi sent Huo Qubing and Wei Qing to fight back against the Huns many times, which gave the Han Dynasty the upper hand in the battle against the Huns. In this way, in these fierce battles, a large number of Huns were inevitably annihilated, and many Xiongnu nobles were captured, which caused a great blow to the Xiongnu forces, so the Xiongnu basically withdrew from the Hexi Corridor, so at this time, the forces of the Han Dynasty appeared again.

Because when he got this land, in order to better control the harmony of the Han Dynasty, he started a series of management such as immigration in Hexi area. Because the land in Hexi is too big, it is difficult to manage only two counties, so in the Han Dynasty, he separated Jiuquan County and several counties in the west of Hexi Corridor and set it as Dunhuang County, while several counties in the west of Wuwei County were independently set as Zhang, so the framework of four counties in Hexi was basically formed.

At that time, Hexi Corridor was the connecting passage between the Central Plains Dynasty and the Western Regions, and it was also an important passage of our Silk Road, so this place was very important for the Han Dynasty. Later, because the Central Plains fell into civil strife and Hexi area was far away from the Central Plains, there was no war spread here. People hid in Hexi to avoid these wars, because the aristocratic families fled to Hexi, which brought a lot of culture and population to Hexi and contributed to the development of Hexi area. Due to the internal power struggle and the policy at that time, Hexi was divided into five cool areas, so the four counties in Hexi gradually became five cities in Hexi.