Mr. Yeng, black hmong is identify by the kinds of clothes they wear and the region where they live. As you know about green, white and stripe hmong. it's the same. I can tell you most black hmong lives in Guangxi and north vietnam. As about chinese. Remember chinese means the people who lives in china. Majority of the people in china are han. Since so many tribes has melt to become han and I would estimate close to 80% of our people has become han due to many wars. We are more related to chinese than thai or laos. Just think about our surname, it is the same as Han chinese not even close to thai or laos. We have the same surname like the Han because some of our ancestor (Hmong) miao has become han chinese. you got it. It's like this country, a lot of india tribe has be come america. you can't tell the different unless you see those people who are still at the reservation.