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Later, Malay, Mon, and Khmer civilizations flourished in the region prior to the domination of the Thais, most notably the kingdom of Srivijaya in the south, the Dvaravati kingdom in central Thailand and the Khmer Empire based at Angkor.
Like many Isan people and more specifically, other ethnic Lao groups of Central Thailand, the Lao Ga are descendants of slaves and forced corvée labourers brought after the Siamese conquest of the successor kingdoms of Lanxang, mostly from the region of Vientiane.