Which dynasties reclaimed land?

According to historical records, the Qin dynasty immigrated to Lingnan and Hetao, and the Han dynasty also reclaimed land on a large scale in the northern and northwest frontiers. The Tang, Yuan, Ming and Qing Dynasties all reclaimed land on a large scale in the border areas, which has been introduced in the section "Frontier Defense" of this book, so I won't go into details here. Therefore, no matter the differences in form-the military and civilian villages before Ming and Qing Dynasties, or the villages of Shang, Qi, Qian and Hui in Ming and Qing Dynasties, or the differences in direct purpose, they all received the dual effects of defending and developing the frontier at that time.