Isan people in the context of "Tai people"

Thai people, historically known as Siamese people, are an ethnic group native to Thailand. In a narrower and ethnic sense, the Thais are also a Tai ethnic group dominant in Central and Southern Thailand (Siam proper). Part of the larger Tai ethno-linguistic group native to Southeast Asia as well as Southern China, Thais speak the Sukhothai languages (Central Thai and Southern Thai language), which is classified as part of the Kra–Dai family of languages. The majority of Thais are followers of Theravada Buddhism.

Government policies during the late 1930s and early 1940s resulted in the successful forced assimilation of various ethno-linguistic groups into the country's dominant Central Thai language and culture, leading to the term Thai people to come to refer to the population of Thailand overall. This includes other subgroups of the Tai ethno-linguistic group, such as the Northern Thais and the Isan people, as well as non-Southeast Asian and non-Tai groups, the largest of which is that of the Han Chinese, who form a substantial minority ethnic group in Thailand.

Thailand is a country of some 70 ethnic groups, including at least 24 groups of ethnolinguistically Tai peoples, mainly the Central, Southern, Northeastern, and Northern Thais; 22 groups of Austroasiatic peoples, with substantial populations of Northern Khmer and Kuy; 11 groups speaking Sino-Tibetan languages ('hill tribes'), with the largest in population being the Karen; 3 groups of Austronesian peoples, i.e., the Malay, the majority ethnic group in the southernmost three provinces, together with the Moken and Urak Lawoi ('sea gypsies'); and both groups of Hmong-Mien. Other ethnic groups include longstanding immigrant communities such as the Chinese, Indians, Persian, and Portuguese.

Northeast Thailand or Isan (Isan/Thai: อีสาน, pronounced [ʔīː.sǎːn] ; Lao: ອີສານ, romanized: Īsān; also written as Isaan, Isarn, Issarn, Issan, Esan, or Esarn; from Pāli 𑀇𑀲𑀸𑀦 isāna or Sanskrit ईशान्य īśānya "northeast") consists of 20 provinces in northeastern Thailand. Isan is Thailand's largest region, on the Khorat Plateau, bordered by the Mekong River (along the Laos–Thailand border) to the north and east, by Cambodia to the southeast and the Sankamphaeng Range south of Nakhon Ratchasima. To the west, it is separated from northern and central Thailand by the Phetchabun Mountains. Isan covers 167,718 km (64,756 sq mi), making it about half the size of Germany and roughly the size of England and Wales. The total forest area is 25,203 km (9,731 sq mi) or 15 percent of Isan's area.

Since the beginning of the 20th century, northeastern Thailand has been generally known as Isan, while in official contexts the term phak tawan-ok-chiang-nuea (ภาคตะวันออกเฉียงเหนือ; "northeastern region") may be used. The majority population of the Isan region is ethnically Lao, but distinguish themselves not only from the Lao of Laos but also from the Central Thai by calling themselves khon Isan or Thai Isan in general. But some refer to themselves as simply Lao, and academics have recently been referring to them as Lao Isan or as Thai Lao, with the main issue with self-identification as Lao being stigma associated with the Lao identity in Thai society.