Eventually, the Tai settled the central plains of Thailand (which were covered with dense rainforest) and displaced and inter-bred with the pre-existing Austroasiatic population.Roger Blench (2008) demonstrates that dental evulsion, face tattooing, teeth blackening and snake cults are shared between the Taiwanese Austronesians and the Tai-Kadai peoples of Southern China.[3][4] James R. Chamberlain (2016) proposes that the Tai-Kadai (Kra-Dai) language family was formed as early as the 12th century BCE in the middle of the Yangtze basin, coinciding roughly with the establishment of the Chu state and the beginning of the Zhou dynasty.[5] The Tai peoples, from Guangxi began moving south – and westwards in the first millennium CE, eventually spreading across the whole of mainland Southeast Asia.[6] Based on layers of Chinese loanwords in proto-Southwestern Tai and other historical evidence, Pittayawat Pittayaporn (2014) proposes that the southwestward migration of southwestern Tai-speaking tribes from the modern Guangxi to the mainland of Southeast Asia must have taken place sometime between the 8th–10th centuries.[7] Tai speaking tribes migrated southwestward along the rivers and over the lower passes into Southeast Asia, perhaps prompted by the Chinese expansion and suppression.[citation needed] The corruption of the Qing dynasty and the massive population increase in China, combined with high taxes, caused many families to leave for Thailand in search of work and a better life.[13] An exception to the China-Laos-Thailand migration pattern is the Iu Mien people, who apparently passed through Vietnam during the 13th century, prior to entering Thailand through Laos.After the war ended, Burma was granted independence in January 1948, and the Karen, led by the KNU, attempted to co-exist peacefully with the Bamar ethnic majority.
Tai-Dong people of Guizhou, China, in traditional dresses, similar to the existing tribe in northern provinces of Thailand