Eleven years before the reign of Emperor Wendi, who suggested that Emperor Wendi adopt a letter to raise people and immigrate to the summer?

In the 11th year of Emperor Wendi (BC 169), Emperor Wendi adopted Chao Cuo's suggestion and sent a letter to recruit people to immigrate to Xia Sai.

Eleven years before Wendi (169), Xiongnu invaded the border and the Emperor's Road repeatedly. Emperor Wen sent his troops to crusade. Chao Cuo took the opportunity to give Wendi a book "On Military Affairs", put forward the viewpoint of "controlling foreigners with barbarians", and pointed out that in the battle with Xiongnu, the equipment should be sharp, the foot soldiers should be strong, the generals should be proficient in military affairs, and the monarch should mainly choose good generals. Wendi appreciated it and gave Chao Cuo a letter as a reward, but he didn't adopt Chao Cuo's initiative.

Chao Cuo then wrote a letter to Wendi, "Keeping the Border and Encouraging Agriculture", proposing that economic measures should be taken to encourage immigrants to resist foreign invasion, which was adopted by Wendi. Therefore, Chao Cuo went to "collect people and stuff" and put forward specific measures on how to arrange the life of immigrants.

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Emperor Wen immediately implemented Chao Cuo's policy of immigration and agriculture. This policy not only played a role in defending Xiongnu at that time, but also initiated the policy of reclaiming farmland in previous dynasties, which had a great influence on later generations. Zhao Chongguo's military settlement in the period of Emperor Wu of Han Dynasty and Cao Cao's reclamation policy in the period of Three Kingdoms are the inheritance and development of Chao Cuo's immigration policy.