First on the conclusion: Ming and Qing dynasties on the Miao people are Chi after the statement, this statement is roughly derived from the harmonization of ethnic groups, attached to may come from the Han people carry forward. And the Miao as one of the fifty-six nationalities, and after the establishment of the country to determine the Miao people's Chi You legend has been logically inherited. But in practice it is difficult to relate.
The Chinese language "Miao", closer to the general name of the various Miao groups called themselves, many people are due to regional autonomy and was divided into "Miao". Although the Hmong live in mountainous areas, their culture and society are different in different regions. The Hmong in the mountain basins and valley plains live by rice cultivation, while the Hmong in the highlands and mountains live by slash-and-burn or planned farming. The Hmong are highly separated from other ethnic groups, but live in mixed communities with their own ethnic groups, and the reality of their lives is very complex. Once upon a time, there were many Hmong people who lived by slash-and-burn hygiene and were extremely mobile.
After the 15th century, a large number of Hmong people moved along the mountains, and now there are many people with the same culture and language as the Hmong in Laos, Thailand, and Vietnam. In this way, the Hmong have spread out over a wide area by moving back and forth. Now, for China, the Miao are a "cross-border people" who have crossed national borders, and their high mobility has caused many international problems. In particular, after 1975, the Hmong (Hmong), who live in the mountains of Laos, fled to Thailand and became refugees.
The Hmong of the Ming and Qing dynasties were very large, stretching from Hunan to Yunnan, and appear to have expanded considerably more than the Cat people. It is possible that today's Hmong are only a part of the Ming and Qing dynasties. It's possible, but it's hard to make sense of all the different groups that have come and gone in different periods of time.