Was there a policy of "migrating to the real border" to expand the territory during the Qin Dynasty?

Immigration border refers to the migration of a large number of people in the mainland to enrich the border, strengthen border defense forces and develop border counties. Immigration policy can be traced back to the pre-Qin period. In the early Warring States period, Chu moved nobles to the border in order to reclaim land, develop border economy and strengthen national defense. In the thirty-third year of Qin Shihuang (2 14 BC), there were "a large number of deaths, and the husband and wife slightly took Lvliang's land as Guilin, Xiang Jun and Nanhai to accommodate the garrison". During the reign of Emperor Wu of the Han Dynasty, in order to strengthen the border defense in the north, in 1 19 BC, more than 700,000 people immigrated at one time, enriching the northern counties and counties, and the combination of soldiers and farmers was implemented, which not only reduced the burden of national soldiers' salaries, but also ensured the security of the border. In Han Dynasty, the economy and culture of the northwest frontier developed rapidly because of the measures of emigrating to the real frontier and stationing fields to defend the frontier. In the history of China, Chao Cuo in the Western Han Dynasty and Wang Fu in the Eastern Han Dynasty advocated the immigration reality. Immigrants in the pre-Qin period mostly used administrative orders. Chao Cuo first put forward economic measures to encourage immigrants, and he also considered the material living conditions and life safety of immigrants in a very specific way. Wang Fu and Chao Cuo's immigration ideas are aimed at resisting foreign invasion. Wang Fu's "reality" thought contains the idea that the population should adapt to the land, which is a new development compared with Chao Cuo.