What positive effects do a large number of immigrants have on the progress of frontier society?

A large number of immigrants settled in border areas, which changed the resident structure of border areas, promoted ethnic integration, improved the regional economic model and structure, and thus promoted the progress of border society. Historically, apart from government-organized immigrants, the Central Plains was the center of struggle, and the destruction of war was often the most dramatic. "There are white bones everywhere, and there are no crows in a thousand miles" was a portrayal of the image of the Central Plains for a long time. Therefore, "immigrants moved to the south of China in waves, that is, to the surrounding areas of the Central Plains. The arrival of Han residents leads to the migration of aborigines to more remote areas, or because the distance between political, economic and cultural centers and remote areas is relatively shortened. However, the superiority of farming economy makes the frontier residents settle more, the combination of residents and land is closer, the feeling of home is increased, and the centripetal force is improved, so the ruling foundation of the empire in the frontier is more stable.