What policies did the Qing government adopt in the face of the critical situation of invasion by foreign powers and loss of territory?

In the mid-19th century, faced with the critical situation of invasion by foreign powers and loss of territory, the Qing government implemented a policy of emigrating to the frontier and took various measures to recruit people from the interior to reclaim wasteland and develop production in the frontier. During the late Qing Dynasty, in the Northeast and Mongolia regions where the ban policy had been implemented, the ban policy was abolished and opened to immigrants, achieving remarkable results.