Are the sweet potatoes and corn introduced into China really the secret to the prosperity of Kang and Qian?

Are the sweet potatoes and corn introduced into China really the secret to the prosperity of Kang and Qian?
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.