Grupa "Tai" to dzisiejsi Tajlandczycy i Laotańczycy:
the southwestward migration of Tai-speaking tribes from Guangxi took place sometime between the 8th-10th centuries (Wikipedia)
Dopiero ok. IX wieku.
Tai Migration Period
Main article: Peopling of Laos
According to a shared legend amongst various Tai tribes, a possibly mythical king, Khun Borom Rachathiriat of Mueang Then (ເມືອງແຖນ, เมืองแถน, [mɯ́əŋ tʰɛ̌ːn]) begot several sons that settled and ruled other mueang, or city-states, across South-East Asia and southern China. Descended from ancient peoples known to the Chinese as the Yue and the Ai Lao, the Tai tribes began migrating into South-East Asia by the beginning of the 1st millennium, but large-scale migrations took place between the 7th and 13th centuries AD, especially from what is now Sipsongbanna, Yunnan Province and Guangxi. The possible reasons for Tai migration include pressures from Han Chinese expansion, Mongol invasions, suitable land for wet rice cultivation and the fall of states that the Tais inhabited.
The Tai ethnic groups are believed to have begun migrating south from China to Southeast Asia during the first millennium CE. While this theory of the origin of the Tai currently predominates, there is insufficient archaeological evidence to prove it, and linguistic evidence alone is not conclusive.
Wietnamczycy wywodzą się z Indonezji.
Khmerowie mogą być ludem irańskim, który przybył poprzez Indie.
Właściwie dlaczego INDOchiny:
The exact nature, process and extent of Indian influence upon the civilizations of the region is still fiercely debated by contemporary scholars. Debated are most claims over whether it was Indian merchants, brahmins, nobles or Southeast Asian mariner-merchants who played a central role in bringing Indian conceptions to Southeast Asia. Debated is the depth of the influence of traditions for the people. Whereas early 20th-century scholars emphasized the thorough Indianization of Southeast Asia, more recent authors argued that this influence was very limited and affected only a small section of the elite. (Wikipedia)
The Tai assimilated or pushed out indigenonus Austroasiatic Mon–Khmer peoples, and settled on the fringes of the Indianised kingdoms of the Mon and Khmer Empire. The blending of peoples and the influx of Indian philosophy, religion, language, culture and customs via and alongside some Austroasiatic element enriched the Tai peoples, but the Tais remained in contact with the other Tai mueang.