Kangxi is known as "an emperor throughout the ages", and during his reign he also laid the foundation for the prosperity of the Qing Dynasty and created a great situation of kangqian's prosperity, which is not unwise, but this great emperor still did a stupid thing, which directly led to the loss of a large area of land in the Qing Dynasty. Xiaobian this will reveal the secret for you:

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Qing Shengzu Ai Xinjue Luo Xuan Ye was the fourth emperor of the Qing Dynasty, with the era name Kangxi. The Kangxi Emperor ascended the throne at the age of 8 and pro-government at the age of 14, reigning for 61 years, making him the longest-reigning emperor in Chinese history. As a teenager, he wisely and decisively defeated the powerful minister Aobai; when he became an adult, he sat in Beijing and destroyed San Francisco; and then he marched three times against Kaldan and won victory... It has to be said that the Kangxi Emperor was a great emperor.
The Kangxi Emperor had been reading poetry since childhood, and was deeply touched by the national idea of "Manchu and Han family" put forward by Emperor Taiji and Emperor Shunzhi, so he went on to put forward the advanced idea of "one view at home and abroad" and "one family under the world". The Kangxi Emperor also found that the Historical Great Wall did not resist the attack of foreign forces, and the existence of the Great Wall was not conducive to the unification of the country, especially the integration with the "Three Norths", so he rejected the proposal to build the Great Wall. The Kangxi Emperor once said to his ministers: "The emperor has his own origin in ruling the world, and he does not monopolize dangers and obstacles." Since the Qin built the Great Wall, the Han, Tang, and Song dynasties have often repaired it, and there is no shortage of trouble at that time? Therefore, he believes that only by "raising" the people well will we be able to obtain the basis of governance, and the border will be self-reinforcing and worry-free. Therefore, the Kangxi Emperor did not build the Great Wall to prevent foreign invasion, but built the "Great Wall" to prevent the movement of the Qing Dynasty people - wicker edge.
Wicker edges are built in the northeast region. It was a three-foot-high earthen embankment made of earth, and the embankment was planted with wicker. So why fix wicker edges? There are three reasons for this. The first point is that the emperors of the Qing Dynasty always felt that the Central Plains was not a place suitable for their long-term survival, so the emperors of the Qing Dynasty always felt that one day they would return to the northeast, so there could not be too many outsiders in the northeast. The second point is that because the northeast region is rich in ginseng, mink and other specialties, these treasures are only for the royal family, so they are afraid that the people of Kannai will enter the northeast region and dig up these treasures. The third point is because in the eyes of the emperor, the northeast region is also the so-called "land of dragon rejuvenation", in order to prevent someone from destroying the "dragon vein", it is necessary to strictly protect it.
Although the amount of engineering on the "wicker edge" was extremely large, in that era of backward productivity, it did consume a lot of manpower and material resources, but after more than 40 years of the Kangxi, Yongzheng and Qianlong dynasties, the wicker in these places still grew into a lush "green Great Wall" with a total length of more than 1300 kilometers. And the implementation of these wicker edges, but also isolated the people of Guannei, to the "drawbacks" of the flow outside the Guanxi, in the end, directly led to a large reduction in the population of the northeast, the northeast of this land is fertile but sparsely populated, how can it not cause the covetousness of foreign invaders next to it, at the end of the 19th century, Tsarist Russia through a variety of wars, to invade the northeast region, and in the early twentieth century, the Qing Dynasty signed various unequal treaties with it, foreign invaders also from the northeast region, It has divided nearly 1.4 million square kilometers of land.
There was no difference between the wicker edge and the historical Great Wall, and the damage they caused to the land and the people was irreparable—this was one of the biggest things the Kangxi Emperor did.
With the development of history, there are several large-scale intrusions into the Kanto, a large number of Kannai people came to the northeast to begin to take root, and carried out a large-scale development of the northeast, although today's "wicker edge" has completely disappeared, but the term wicker edge, or really left, let us think about history, reminisce about the present, look forward to the future.
Wen xiucai, editor-in-chief of Wenlan Hairun Studio, this article is written by: Special history writer: Feng Doudou