from European traders and diplomats, while maintaining an independent course. Chinese, Malay, and British influences helped to further shape the Thai people who often assimilated foreign ideas, but managed to preserve much of their culture and resisted the European colonization that engulfed their neighbors. Thailand is also the only country in Southeast Asia that was not colonized by European powers in modern history. The concept of a Thai nation was not developed until the beginning of the 20th century, under Prince Damrong and then King Rama VI (Vajiravudh). Before this era, Thai did not even have a word for 'nation'. King Rama VI also imposed the idea of "Thai-ness" (khwam-pen-thai) on his subjects and strictly defined what was "Thai" and "un-Thai". Authors of this period re-wrote Thai history from an ethno-nationalist viewpoint, disregarding the fact that the concept of ethnicity had not played an important role in Southeast Asia until the 19th century. This newly developed nationalism was the base of the policy of "Thaification" of Thailand which was intensified after the end of absolute monarchy in 1932 and especially under the rule of Field Marshal Plaek Phibunsongkhram (1938–1944). Minorities were forced to assimilate and the regional differences of northern, northeastern and southern Thailand were repressed in favour of one homogenous "Thai" culture. As a result, many citizens of Thailand cannot differentiate between their nationality (san-chat) and ethnic origin (chuea-chat). It is thus common for descendants of Jek เจ๊ก (Chinese) and Khaek แขก (Indian, Arab, Muslim), after several generations in Thailand, to consider themselves as "chuea-chat Thai" (ethnic Thai) rather than identifying with their ancestors' ethnic identity. Other peoples living under Thai rule, mainly Mon, Khmer, and Lao, as well as Chinese, Indian or Muslim immigrants continued to be assimilated by Thais, but at the same time they influenced Thai culture, philosophy, economy and politics. In his paper Jek pon Lao (1987) (เจ้กปนลาว—Chinese mixed with Lao), Sujit Wongthet, who describes himself in the paper as a Chinese mixed with Lao (Jek pon Lao), claims that the present-day Thai are really Chinese mixed with Lao. He insinuates that the Thai are no longer a well-defined race but an ethnicity composed of many races and cultures. The biggest and most influential group are the Thai Chinese. Theraphan Luangthongkum, a Thai linguist of Chinese extraction, claims that 40% of the Thai population are descendants of former Chinese immigrants. A recent study shows that