What is the purpose of reclamation?

After the Qin and Han Dynasties, whether the garrison stationed in the frontier opened up wasteland or the mainland immigrants moved to the frontier, most of them were mainly agriculture, which was related to the policy of "building the country through agriculture". The unified Central Plains dynasties, such as Qin, Han, Tang, Yuan, Ming and Qing, paid attention to stationing troops to open up wasteland in border areas, with the direct purpose of solving the problem of military grain supply and reducing the burden of the central government, which played an important role in developing border areas in some areas. At the same time, these unified dynasties also carried out the policy of emigrating to the border areas, using the powerful power of the central government to immigrate to the border areas on a large scale, especially in the north and northwest, not only to develop the border areas, but also to defend the nomadic people in the border areas and achieve long-term stability in the border areas.