Why do Manchu people die much faster than Mongolians?

The first step is to establish a supranational military group like "Banneker" to help the Chinese spread in the group objectively. The second step is that most Manchu-speaking people will stop living together and live with Chinese-speaking people on a large scale, which will help the spread and infiltration of Chinese again. The third step is that in Jilin and Heilongjiang, where Manchu people live in concentrated communities, large-scale immigrants from China entered at the end of 19, completely ending the Manchu-inhabited communities. In fact, the third step is bound to happen. Different from the semi-arid areas of Mongolia, the Nuzhen language in the northeast and Ainu language in Hokkaido are both forest areas with fertile land and abundant rainfall. /kloc-in the 6th century, high-yield crops flowed from America to the world, and then the farming peoples in East Asia went to population explosion. /kloc-at the end of 0/9, on the one hand, it was a huge population pressure, on the other hand, it was the gradual advancement of Russia. It is an inevitable result that a farmer from China and Honshu gets married and has children, and moves north to the border. In human history, all ethnic groups have been in a state of mixed living and serious population disadvantage. There are few such examples, including only some Abrahamic monotheistic ethnic groups. There are also Chinese in Muslim countries in Southeast Asia (like Thailand, the Chinese have almost melted away).