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In page Khmer Rouge:

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One of the regime's defining characteristics was its Khmer ultranationalism, which combined an idealisation of the Angkor Empire (802–1431) with an existential fear for the survival of the Cambodian state, which had historically been liquidated during periods of Vietnamese and Siamese intervention.[1] The spillover of Vietnamese fighters from the Vietnamese–American War further aggravated anti-Vietnamese sentiments as the 1960s went on: the Khmer Republic under Lon Nol, overthrown by the Khmer Rouge, had itself promoted Mon-Khmer nationalism and was responsible for several anti-Vietnamese pogroms during the 1970s.[2] Some historians such as Ben Kiernan have stated that the importance the regime gave to race overshadowed its conceptions of class.[3]:26