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It is a legend told by the Chinese People. It's not my legend or my people legend so how can I know what you're saying.
Actually, that is what I have been trying to tell you all this while, but you wouldn't accept it. My opinion is that the Three Miao legend was not originally your people's legend. It is probably a Chinese legend that was adopted by your people as an origin myth, very late in their history.
Your people definitely had other myths or legends about their origins. Unfortunately, those may now be lost because they were replaced by the foreign Three Miao legend.
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It's like the Chinese called Shang Dynasty Shang while the Korean called Shang Dynasty Eun Dynasty.
'Eun' is just the Korean pronunciation of 'Yin' 殷, which is another name of the Shang dynasty. The Chinese have long used both names.
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Miao people don't called themselves Miao however the term Miao was used by the Chinese to categorized a group of people once lived in the Yellow River Valley.
That is not correct. The Chinese records speak only of the Three Miao as people who once lived along the Middle Yangzi River (much further south than the Yellow River), and were eventually exiled to the
far west.
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You haven't give any clear answer but just questions.
Actually the opposite is true. I have asked very few questions, and given quite a number of answers. The real problem is that you don't like my answers.
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Do Chinese passed down oral tradition or do they just write down whatever they feel is right and then tell people that what was written down is right.
I can't answer that question because I cannot read the minds of ancient Chinese historians. But quite an important part of the really ancient Chinese legends about the sage-kings was originally passed down through oral tradition, and are as a result not considered fully reliable by historians today. That includes the part about the Three Miao.
But an unreliable written account written 2,000 years ago, about an event that took place 5,000 years ago, is still considered more reliable than a folktale being told today about an event that took place 5,000 years ago, because there is 2,000 less years of potential distortion and inaccuracy. That is a basic principle of historiography.
If the Miao people had historical records in their own script 700 years ago, before the period of contact with north Chinese culture (including the north Chinese story of the Three Miao), and if these records survived and could be read today, they might give us a much more reliable picture of early Miao history. Unfortunately, those records either never existed, or have been lost. It is impossible today to reconstruct with a sufficient level of reliability the myths and stories that the Miao tribes had before the 14th century.