At the same time that the ancestors of South Asia formed the Sino-Tibetan language family along the western part of the Yunnan-Guizhou Plateau, a group of South Asian ancestors migrated southeast across the rugged mountains. of Laos (老挝). Ten thousand years ago, the ancestors of the Austro-Thai language (澳泰 Nam Dao – Thai) formed in the southern Gulf of Tonkin, this yellow-skinned strain entered China from Vietnam and Guangxi with the M119 mutation, traveling along the coast. sea ​​to the northeast, forming the Bach Viet group.
An ancient Austro-Thai language group (澳泰- Nam Dao-Thai) was formed more than 20,000 years ago in the southern Gulf of Tonkin. This group of ancient Austro-Thai languages ​​is called Bach Viet in the ethnographic system. historical range from the Jiaozhi area (northern Vietnam) to the Jiangsu and Zhejiang areas. In thousands of years, the division was born (诞生): Le, Dong, Thuy, Ngat Lao, Cao Son, Zhuang, and Thai. This group is linguistically consistent and they are also known collectively as the Vietnamese (越人).
Twenty thousand years ago, when the Austro-Thai language family ((澳泰- Nam Dao – Thai ) was formed, there was a group of tribes moving along the coast, they hardly left any trace, they moved to the river. After that, the ancestors of the Altaic language family migrated to the surrounding areas, dividing into Mong Neck and Turkey to the west, joins Korea and Japan to the east, travels north across the Bering Strait (白令海) to the Americas.
The M110 subtype of M119 is more specific in Eastern Europe, it is not found in the Han people, it accounts for a significant proportion of the local Ma Kieu population of Shanghai, Fujian, the type is not the same, the mutant M88 only in Western Europe accounted for 8% Guangdong has 7%. The harmonious exchange between Bach Viet and other ethnic groups is a very complicated process, with Bach Viet’s components targeting other ethnic groups, adding other ethnic groups to Bach Viet, even potentially Many tribes in the west have integrated into Bach Viet.
The large-scale migration to the west of the Trang Tai group must have occurred after the fall of Nam Viet during the Han Dynasty, indicating that the Tai people entered Thailand during the Tang Dynasty. Migration from western Burma (勐卯國) in Yunnan to India in 1215.
In the book “History of Peoples in Lingnan” we discuss in detail the ethnic groups in Lingnan from the perspective of combining history and genetics. On the other hand, the introduction of anthropology helps people to perceive a new way of understanding the Lingnan ethnic origin from a genetic perspective.
Molecular anthropology discovered that the ancestors of the Lingnan people came to the coast of the Gulf of Tonkin 2-3 thousand years ago and developed in this area for a very long time. During this time there was almost no group division. About 18,000 years ago, the ancestors of the Le tribe and the ancestors of the people in the Linh Nam area arose a certain difference. Then the ancestors of Linh Nam from the center of the Gulf of Tonkin, extended along the coasts of the East Sea. Some of them were along the coast of Guangdong and Lucqiao Taiwan, and arrived in Taiwan about 14,000 years ago. The other branch going south along the coast of Vietnam developed into a Malay ethnic group. The Malay and northern Lingnan groups arose about 12 thousand years ago.
About ten thousand years ago, the group in the Gulf of Tonkin and the groups in Guangdong arose a divergence, the former being mainly the ancestors of the later Yi Lao (仡佬), and the latter being the ancestors of the linguistic group.

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