This sentence reminds me of Poland, a former European power, because of the use of the aristocratic collegiate clan, the national power became weaker.
At that time, the main birthplace of Chinese history was the division of the North and the South by the Jin and Song Dynasties. The Han people are still the main body, such as Yuan Haowen is the character of the Jin Dynasty. This group of Jurchen people who entered the north eventually became Sinicized, even if he died.
The Manchu Qing attacked Korea, a vassal state of the Ming Dynasty, mainly twice, the Dingmao chaos in 1627 and the Bingzi chaos in 1636.
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