What is Meng Tian's second move to consolidate its border defense?

The second measure is "border control". Meng Tian led the army to open up the "Land of Henan". Although it is thousands of miles wide, the land is vast and sparsely populated, and nothing grows. A large number of troops are stationed on the border thousands of miles away from Xianyang, and it is very difficult to supply military supplies. In order to solve the military supplies and consolidate the frontier. He divided all the newly reclaimed land into 34 counties, all of which belonged to Jiuyuan County, and established a set of administrative agencies to manage the border. He also sent more than 30,000 criminals, and transferred a large number of immigrants to Zhao He, Yuzhong and other places to reclaim and develop the economy, so that the agricultural and animal husbandry production in this area gradually developed. All these have played a positive and important role in strengthening border defense.