Wu Sangui can be said to be an important figure in the late Ming and early Qing Dynasties. He opened Shanhaiguan so that the Qing army could directly enter the hinterland of the Ming Dynasty. If he didn't choose to betray the Ming Dynasty, fought bloody battles and didn't back down, then who would die is still unknown. After Wu Sangui betrayed the Ming Dynasty, he was almost attacked from both sides. Chongzhen was hanged from an old crooked-neck tree, and the Ming Dynasty almost perished. Later, the small court of Nanming reluctantly continued its name.
After Wu Sangui betrayed the Ming Dynasty, he was rewarded by the Qing Dynasty, but during the reign of Kangxi, Kangxi was extremely wary of him. At the beginning, there were not many troops in Ming and Qing dynasties, and these people were needed to control local rule. Of course, the Qing government knew that these people were malignant tumors and could betray them once or twice, so it was still very vigilant against them.
Wu Sangui himself knew what kind of person he was, so he rebelled, and their rebellion was echoed by the whole world, because the Qing government was unpopular for a period of time, and most of the places were adherents of the Ming Dynasty. Wu Sangui carried the banner, and the people responded in succession, and the momentum swept half the country for a while, but Wu Sangui was unpopular, and the policies of the Qing government were also very insidious. He wooed one gang, fought another, and lured another, which led to the final downfall of Wu Sangui.