Can you tell me about the origin of Miao nationality and what ethnic group Hakka people are?

At present, there are three main views on the origin of Hakkas: (1) the development and evolution of Han people who migrated from the north to the south; (2) The Han people who migrated from north to south merged with the southern natives and evolved; (3) The indigenous people in the south merged with the Han people who migrated from the north to the south and evolved. In the eyes of ordinary people, Hakkas are immigrants, a branch of Han immigrants from the north to the south. In the long years, they have been displaced from place to place and experienced hardships, forming, evolving and developing into a large clan with a population of tens of millions. According to Miao historical records, Chiyou, a member of Yan Di, went south on the back of the Yellow Emperor after becoming a Chiyou tribe, and entered Baiyue, where he lived in today's Hunan, Guangxi, Yunnan and Guizhou.