The Yuan Dynasty and the Ming Dynasty never captured the Western Regions. Why did the Qing Dynasty capture them?

The ancient unified dynasty basically extended eastward to the sea, northward to the grassland, westward to the Gobi Desert and southward to the jungle. For the dynasty dominated by farming civilization, the sea, grassland, desert and jungle are obviously not of great use value, but just a burden, so they stop here to manage the land suitable for farming in China. Xiongnu retreated to the northwest and needed to further attack Xiongnu through the western regions. There is also the Silk Road on land, which brought many benefits to the economy of the Western Han Dynasty. As an important area on the Silk Road, it is natural for the western regions to vigorously manage and control them, which means that they can get huge economic returns. In the early Qing dynasty, little attention was paid to the western regions. During the reign of Kangxi, Junggar in the northwest rose strongly under the leadership of Gauldin. After the northwest of Junggar, galdan began to fight with Khalkha Mongols, which directly threatened the border of Qing Dynasty. Later, Gauldin even marched into Wulanbutong, Inner Mongolia, just 700 miles from Beijing. In this way, the nature has changed, which means that Gauldin will compete with the Qing Dynasty for the world and get their hands on the Central Plains.

For the famine in northwest China, Emperor Kangxi levied galdan three times. Since then, the war between the two sides has lasted for nearly a hundred years and experienced three dynasties: Kangxi, Yongzheng and Qianlong. Until the Qianlong period, the civil strife in Junggar was completely eliminated, and then the western regions were recovered. Before the Qing Dynasty, the relationship between Northeast China and Chinese mainland was much closer than other areas mentioned above, but it was not until the Qing Dynasty that it officially became an important territory of the whole dynasty, because it was their hometown. Before the rise of Shanhaiguan, nomadic people were constantly fighting with each other and forming alliances, not only between Manchu and Mongolian.

During the Ming Dynasty, Vara, Tatar and Grutai kept pace and United against the Ming Dynasty. However, in the Qing Dynasty, a wise master like Gerdan appeared in Mongolia, but most of the nobles on the grassland stood on Kangxi's side. Having said that, I have to admire Qing's powerful learning ability. He Shen was a unique skill of the Central Plains Dynasty, but it was well studied by the Qing Dynasty, and it developed into intermarriage and packet. It is a kind of pride that the Ming Dynasty didn't cede territory or have relations with people, but it is even more commendable that the Qing Dynasty could defeat the enemy without fighting.