Ratanakiri has been occupied since at least the
Stone or
Bronze Age, and trade between the region's highlanders and towns along the
Gulf of Thailand dates to at least the 4th century A.D. The region was invaded by
Annamites, the
Cham, the
Khmer, and the
Thai during its early history, but no empire ever brought the area under centralized control. The region was conquered by local
Laotian rulers in the 18th century and then by the Thai in the 19th century. The area was incorporated into
French Indochina in 1893, and colonial rule replaced slave trading. The French built huge rubber plantations, especially in Labansiek (present-day
Banlung); indigenous workers were used for construction and rubber harvesting. Although highland groups initially resisted their colonial rulers, by the end of the colonial era in 1953 they had been subdued. The name
Ratanakiri (រតនគិរី) is formed from the
Khmer words រតនៈ (
rôtânô "gem" from
Sanskrit ratna) and គិរី (
kĭri "mountain" from Sanskrit
giri), describing two features for which the province is known. During the 1950s and 1960s,
Norodom Sihanouk instituted a development and Khmerization campaign in northeast Cambodia that was designed to bring villages under government control, limit the influence of insurgents in the area, and "modernize" indigenous communities. Some
Khmer Loeu were forcibly moved to the lowlands to be educated in Khmer language and culture, ethnic
Khmer from elsewhere in Cambodia were moved into the province, and roads and large rubber plantations were built. After facing harsh working conditions and sometimes involuntary labor on the plantations, many Khmer Loeu left their traditional homes and moved farther from provincial towns. In 1968, tensions led to an uprising by the
Brao people in which several Khmer were killed. The government responded harshly, torching settlements and killing hundreds of villagers.|alt=A room with a curtain and an American flag in the background. A man in a suit points to Cambodia on a large standing map of Southeast Asia.|thumb|left In the 1960s, the ascendant
Khmer Rouge forged an alliance with ethnic minorities in Ratanakiri, exploiting Khmer Loeu resentment of the central government. The
Communist Party of Kampuchea headquarters was moved to Ratanakiri in 1966, and hundreds of Khmer Loeu joined CPK units. During this period, there was also extensive
Vietnamese activity in Ratanakiri. Vietnamese
communists had operated in Ratanakiri since the 1940s; at a June 1969 press conference, Sihanouk said that Ratanakiri was "practically
North Vietnamese territory". Between March 1969 and May 1970, the United States undertook a massive
covert bombing campaign in the region, aiming to disrupt sanctuaries for communist Vietnamese troops. Villagers were forced outside of main towns to escape the bombings, foraging for food and living on the run with the Khmer Rouge. In June 1970, the central government withdrew its troops from Ratanakiri, abandoning the area to Khmer Rouge control. The Khmer Rouge regime, which had not initially been harsh in Ratanakiri, became increasingly oppressive. The Khmer Loeu were forbidden from speaking their native languages or practicing their traditional customs and religion, which were seen as incompatible with communism. Communal living became compulsory, and the province's few schools were closed. Purges of ethnic minorities increased in frequency, and thousands of refugees fled to Vietnam and Laos. Preliminary studies indicate that bodies accounting for approximately 5% of Ratanakiri's residents were deposited in mass graves, a significantly lower rate than elsewhere in Cambodia. After the
Vietnamese defeated the Khmer Rouge in 1979, government policy toward Ratanakiri became one of benign neglect. Long after the fall of the Khmer Rouge regime, however, Khmer Rouge rebels remained in the forests of Ratanakiri. Rebels largely surrendered their arms in the 1990s, though attacks along provincial roads continued until 2002. The national government has built roads, encouraged tourism and agriculture, and facilitated rapid immigration of lowland Khmers into Ratanakiri. Road improvements and political stability have increased land prices, and
land alienation in Ratanakiri has been a major problem. Despite a 2001 law allowing indigenous communities to obtain collective title to traditional lands, some villages have been left nearly landless. and even land "sales" have often involved bribes to officials, coercion, threats, or misinformation. In the 2000s, Ratanakiri also
received hundreds of Degar (Montagnard) refugees fleeing unrest in neighboring Vietnam; the Cambodian government was criticized for its forcible repatriation of many refugees. ==Geography and climate==