Why did emigration to Northeast China in Qing Dynasty help to increase government revenue?

Before the Han immigrants in Northeast China, the mode of production of Nuzhen and other ethnic minorities was fishing, hunting and gathering, not farming. Even after liberation, the "productive forces adapt to the relations of production" of many ethnic minorities eventually reached slave society or even primitive society.

It can be seen that this rich black land in Northeast China was largely idle before the Qing Dynasty immigrants, and the cultural level of local residents was generally low. Slightly wealthy Manchu aristocrats, the manor did not have the help of workers and peasants. This is in contradiction with the successful feudalism and the Manchu-Mongolian Qing Dynasty, which relied on agriculture as its national income.

At the same time, in the early years of Qing dynasty, it was unpopular and against the historical trend to ban customs in order to preserve the primitive customs in Northeast China. However, after the Opium War, Russia also bared its teeth in the depths of the Qing Dynasty. After seizing the territory of outer Manchuria, it even attempted to annex the inner northeast. This led to the shortage of soldiers in Northeast China, which objectively promoted immigration and reduced the financial consumption of dispatching troops.

Therefore, it can be seen that immigration to the Northeast brought about an increase in fiscal revenue and a decrease in expenditure, which certainly improved the finances of the Qing government.