Inner Mongolia is an autonomous region of People's Republic of China (PRC) (China), while Outer Mongolia is the Republic of Mongolia. Historically, the relationship between Inner Mongolia and Outer Mongolia is very complicated. Inner Mongolia and Outer Mongolia belong to the Mongolian Plateau, and they have a constant name, that is, desert.

From the Warring States to the Qin and Han Dynasties, the Central Plains Dynasty and Xiongnu fought for the Hetao area many times. During the Warring States Period, King Wuling of Zhao established cavalry, occupied the Hetao Plain, emigrated, reclaimed land and built the Great Wall in the Hetao area.

In the Han Dynasty, people called the south of the Gobi Desert "desert south" and the north of the Gobi Desert "desert north". Emperor Wu of the Han Dynasty launched the battle of the desert south, 124 recovered the desert south, and 1 19 launched the battle of the desert north to destroy the main force of Xiongnu. Since then, many tribes of the Huns began to surrender to the Han Dynasty, which settled most of them in Monan to help the Han Dynasty defend the frontier.

In the first 60 years, Xiongnu was divided into Xiongnu and Xiongnu. Xiongnu is bounded by Gobi and Yinshan, attached to the Han Dynasty, and hostile to the Han Dynasty. After the northern Xiongnu moved westward, Xiongnu moved to Mobei. In 48 years, it was divided into north and south parts.

Xiongnu built the court, and the five-yuan competition belonged to the Eastern Han Dynasty, guarding the border for the Eastern Han Dynasty. During the Sixteen Kingdoms period in Wuhu, the southern Xiongnu moved to Hetao area, then moved to the Central Plains area and merged into the Han nationality.