For a long time, there has been a saying that the so-called "prosperous age of Kang and Qian" in the early Qing Dynasty was actually "the prosperous age of sweet potato". What is the prosperous age of sweet potato?
For a long time, there has been a saying in
first, the Qing Dynasty experienced a long-term peace rarely seen in Chinese history.
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second, the Qing Dynasty implemented a series of policies to increase the population.
the third is sweet potato and corn potato. The introduction of high-yielding crops in America.