Qing dynasty
Population growth and mobility

The population grew in numbers, density, and mobility. The population grew from roughly 150 million in 1700, about what it had been a century before, then doubled over the next century, and reached a height of 450 million on the eve of the Taiping Rebellion in 1850. The spread of New World crops, such as maize, peanuts, sweet potatoes, and potatoes decreased the number of deaths from malnutrition. Diseases such as smallpox were brought under control by an increase in inoculations. In addition, infant deaths were decreased due to improvements in birthing techniques performed by doctors and midwives and an increase in medical books available to the public. Government campaigns decreased the incidence of infanticide. In Europe population growth in this period was greatest in the cities, but in China growth in cities and the lower Yangzi was low. The greatest growth was in the borderlands and the highlands, where farmers could clear large tracts of marshlands and forests.

The population was also remarkably mobile, perhaps more so than at any time in Chinese history. Indeed, the Qing government did far more to encourage mobility than to discourage it. Millions of Han Chinese migrated to Yunnan and Guizhou in the 18th century, and also to Taiwan. After the conquests of the 1750s and 1760s, the court organized agricultural colonies in Xinjiang. This mobility also included the organized movement of Qing subjects overseas, largely to Southeastern Asia, to pursue trade and other economic opportunities.

Manchuria, however, was formally closed to Han settlement by the Willow Palisade, with the exception of some bannermen. Nonetheless, by 1780, Han Chinese had become 80% of the population. The relatively low populated territory was vulnerable as the Russian Empire demanded the Amur Annexation annexing Outer Manchuria. In response, the Qing officials such as Tepuqin (特普欽), the Military Governor of Heilongjiang in 1859–1867, made proposals (1860) to open parts of Guandong for Chinese civilian farmer settlers in order to oppose further possible annexations. In the later 19th century, Manchuria was opened up for Han settlers leading to a more extensive migration, which was called Chuang Guandong (simplified Chinese: 闯关东; traditional Chinese: 闖關東) literally "Crashing into Guandong" with Guandong being an older name for Manchuria. At the end of the 19th century and turn of the 20th century, to counteract increasing Russian influence, the Qing Dynasty abolished the existing administrative system in Manchuria and reclassified all immigrants to the region as Han (Chinese) instead of minren (民人, civilians, non-bannermen), while replacing provincial generals with provincial governors. From 1902 to 1911, seventy civil administrations were created due to the increasing population of Manchuria.
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