Do you know who the most despicable traitor, the most shameless personality, the thickest skin, and the most sinful traitor in Chinese history are?
For the sake of his glory and wealth, he gave all the sixteen states of Yanyun to the Khitan, so that the soldiers of the Central Plains Dynasty had to use their flesh and blood to resist the cavalry impact of the northern nomads on the thousands of miles of plains. This person is the famous child emperor -- Shi Jingjiao! The number one traitor in China in the past 5,000 years is well deserved.
At its peak, the Northern Song Dynasty only took back half of the sixteen states of Yanyun, and the shame and demise of the Song Dynasty was in a sense due to the loss of control of the sixteen states of Yanyun.
Until the first year of Hongwu, when Xu Da, the first general of the founding of the Ming Dynasty, rushed into Qihuamen, the capital of the Yuan Dynasty, and lost more than 400 years of Yanyun Sixteen Prefectures, he finally returned to the embrace of the motherland, he was like a pair of arms, resisting the cavalry impact of the northern nomads for the Central Plains Dynasty. Under its protection, the people of the Central Plains have a rare opportunity to recuperate.