Because Li once captured Nurhachi. At that time, the power of building slaves was not so strong. However, his wife Li Hou later chose to let the Nurhachi brothers go. In fact, the main reason is that Li and Nurhachi are related. Because Li asked his son Li to marry the daughter of Nurhachi's younger brother Shurhachi. So for this purpose, his wife Li will choose to let Nurhachi go.

Nurhachi was indeed a man with great military talent. He unified the Jurchen tribe at that time with his own efforts. Because at that time, Nuerhachi's Jianzhou Jurchen tribe was not so strong. Later, relying on the power of Li in the Ming Dynasty, the Jurchen tribe was gradually unified. Later, Nurhachi also established the post-Jin regime. This also makes the late Jin Dynasty a great threat to the Ming Dynasty. So this also laid the groundwork for the demise of the Ming Dynasty.

In fact, we saw that the power of the post-Jin regime was not strong enough to destroy the Ming Dynasty. However, in the Ming Dynasty, people were miserable because of fatuity and corruption, which led to many peasant uprisings in the Ming Dynasty. Later, Li Zicheng congratulated Beijing and let Chongzhen commit suicide. In addition, the plague in Beijing was rampant at that time. Li Zicheng's troops at that time had a very serious plague infection. Later, in order to prevent the plague from spreading, Li Zicheng chose to give up Beijing.

Later, it was renamed the Qing Dynasty, and later the Qing Dynasty consolidated its rule in the Central Plains. At that time, many local governments appeared in the south, but later the Qing Dynasty wiped out these southern governments through its superior forces and later unified the whole country.