Why are there so many Manchu people in Weihai?

Due to historical reasons, some important cities within the Great Wall are basically strategic places where the Eight Banners were stationed in the Qing Dynasty.

Han Chinese were not allowed to go out of the customs in Qing Dynasty (because of Longxing Land). Before the Qing Dynasty, there was no actual control in Northeast China. Later, when I entered Kanto, there were more talents outside the customs. Later, after the Qing Dynasty, there was a great pressure to survive in Shanhaiguan Pass, and many people immigrated to the Northeast. After liberation, I also went a lot. Finally, there are few Manchus in Northeast China, and the sense of existence is not strong. Su Shen, the ancestor of Manchu people, sent envoys to pay tribute to Zhou in more than 1000 BC. In the Han Dynasty, SuShen was called Lou, in the Northern and Southern Dynasties, BuJi, and in the Sui Dynasty, _ _. Da Zuorong, the leader of the late Soviet Union, was made king of Bohai County by the Tang Dynasty and established the Bohai Kingdom, which was the first local regime in the history of Manchu.