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In page History of Laos:

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By the 2nd century CE, Austronesian settlers had established an Indianised kingdom known as Champa along modern central Vietnam. The Cham people established the first settlements near modern Champasak in Laos[citation needed]. Funan expanded and incorporated the Champasak region by the sixth century CE, when it was replaced by its successor polity Chenla. Chenla occupied large areas of modern-day Laos as it accounts for the earliest kingdom on Laotian soil.[1][2]