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Expanded History

History of Cambodia

From antiquity to the modern era — the historical eras, key events, and narrative that shaped Cambodia.

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Overview

A gate of the Angkor Thom temple complex, circa A.D. 1200 THE KHMER PEOPLE were among the first in Southeast Asia to adopt religious ideas and political institutions from India and to establish centralized kingdoms encompassing large territories. The earliest known kingdom in the area, Funan, flourished from around the first to the sixth century A.D. It was succeeded by Chenla, which controlled large areas of modern Cambodia, Vietnam, Laos, and Thailand (known as Siam until 1939). The golden age of Khmer civilization, however, was the period from the ninth to the thirteenth century, when the kingdom of Kambuja, which gave Kampuchea, or Cambodia, its name, ruled large territories from its capital in the region of Angkor in western Cambodia. Under Jayavarman VII (1181-ca. 1218), Kambuja reached its zenith of political power and cultural creativity. Following Jayavarman VII’s death, Kambuja experienced gradual decline. Important factors were the aggressiveness of neighboring peoples (especially the Thai, or Siamese), chronic interdynastic strife, and the gradual deterioration of the complex irrigation system that had ensured rice surpluses. The Angkorian monarchy survived until 1431, when the Thai captured Angkor Thom and the Cambodian king fled to the southern part of his country. The fifteenth to the nineteenth century was a period of continued decline and territorial loss. Cambodia enjoyed a brief period of prosperity during the sixteenth century because its kings, who built their capitals in the region southeast of the Tonle Sap (Great Lake) along the Mekong River, promoted trade with other parts of Asia. This was the period when Spanish and Portuguese adventurers and missionaries first visited the country. But the Thai conquest of the new capital at Lovek in 1594 marked a downturn in the country’s fortunes and Cambodia became a pawn in power struggles between its two increasingly powerful neighbors, Siam and Vietnam. Vietnam’s settlement of the Mekong Delta led to its annexation of that area at the end of the seventeenth century. Cambodia thereby lost some of its richest territory and was cut off from the sea. Such foreign encroachments continued through the first half of the nineteenth century because Vietnam was determined to absorb Khmer land and to force the inhabitants to accept Vietnamese culture. Such imperialistic policies created in the Khmer an abiding suspicion of their eastern neighbors that flared into violent confrontation after the Khmer Rouge (see cambodia/kh_appnb.asp">Appendix B) established its regime in 1975. In 1863 King Norodom signed an agreement with the French to establish a protectorate over his kingdom. The country gradually came under French colonial domination. During World War II, the Japanese allowed the French government (based at Vichy) that collaborated with the Nazis the Vichy French to continue administering Cambodia and the other Indochinese territories, but they also fostered Khmer nationalism. Cambodia enjoyed a brief period of independence in 1945 before Allied troops restored French control. King Norodom Sihanouk, who had been chosen by France to succeed King Monivong in 1941, rapidly assumed a central political role as he sought to neutralize leftist and republican opponents and attempted to negotiate acceptable terms for independence from the French. Sihanouk’s "royal crusade for independence" resulted in grudging French acquiescence to his demands for a transfer of sovereignty. A partial agreement was struck in October 1953. Sihanouk then declared that independence had been achieved and returned in triumph to Phnom Penh. The following year, as a result of the Geneva Conference on Indochina, Cambodia was able to bring about the withdrawal of the Viet Minh (see cambodia/kh_appnb.asp">Appendix B) troops from its territory and to withstand any residual impingement upon its sovereignty by external powers. In order to play a more active role in national politics, Sihanouk abdicated in 1955 and placed his father, Norodom Suramarit, on the throne. Now only a prince, Sihanouk organized his own political movement, the Popular Socialist Community, (Sangkum Reastr Niyum, or Sangkum), which won all the seats in the National Assembly in the 1955 election. The Sangkum dominated the political scene until the late 1960s. Sihanouk’s highly personal ruling style made him immensely popular with the people, especially in rural villages. Although the Sangkum was backed by conservative interests, Sihanouk included leftists in his government, three of whom--Khieu Samphan, Hou Yuon, and Hu Nim--later became leaders of the Khmer Rouge. In 1963 he announced the nationalization of banking, foreign trade, and insurance in a socialist experiment that dried

Historical Eras

The major periods of {country}’s history at a glance.

  1. Funan & Chenla

    100 – 802

    The earliest Indianized kingdoms of mainland Southeast Asia emerged in the Mekong Delta region. Funan, a trading and agrarian state heavily influenced by Indian religion and statecraft, flourished from roughly the first to sixth century before being absorbed by its successor polity, Chenla, which expanded Khmer dominion across much of modern Cambodia, Laos, and Vietnam.

  2. Angkor Empire

    802 – 1431

    Jayavarman II unified the Khmer realm in 802 and inaugurated the Angkor period, the zenith of Khmer civilization. At its height under Jayavarman VII (1181–ca. 1218), the empire controlled vast territories from its monumental capital at Angkor, producing masterworks of hydraulic engineering and temple architecture. Sustained Thai pressure, dynastic strife, and the collapse of the irrigation network led to the abandonment of Angkor after the Siamese sacked it in 1431.

  3. Post-Angkor Decline

    1431 – 1863

    With Angkor lost, the Khmer court relocated southward toward the Mekong, and Cambodia was reduced to a buffer state contested by Siam and a expanding Vietnam. The Thai seized the capital Lovek in 1594, and by the late seventeenth century Vietnam had annexed the Mekong Delta, severing Cambodia from the sea. Centuries of territorial attrition left the kingdom politically fragmented and economically weakened.

  4. French Protectorate

    1863 – 1953

    King Norodom signed a protectorate agreement with France in 1863, initiating nine decades of colonial rule that gradually stripped the monarchy of real authority. During World War II, Japanese occupation paradoxically fostered Khmer nationalist sentiment even while Vichy French administrators remained in place. King Norodom Sihanouk's sustained diplomatic campaign — his Royal Crusade for Independence — compelled France to transfer sovereignty, and full independence was declared in November 1953.

  5. Sihanouk & War Years

    1953 – 1975

    Independent Cambodia navigated Cold War pressures under Sihanouk, who abdicated the throne in 1955 to dominate civilian politics and pursued a precarious neutrality. A US-backed coup in 1970 installed Lon Nol, drawing Cambodia fully into the Vietnam War and enabling the Khmer Rouge insurgency to grow. Years of US bombing and civil conflict devastated the countryside and set the stage for the Khmer Rouge's seizure of Phnom Penh in April 1975.

  6. Khmer Rouge & Recovery

    1975 – 1993

    The Khmer Rouge regime evacuated cities, abolished currency, and executed perceived enemies in an agrarian revolution that killed an estimated 1.5 to 2 million people between 1975 and 1979. A Vietnamese invasion in late 1978 toppled the regime but sparked over a decade of civil war and international isolation. The 1991 Paris Peace Accords and UN-supervised elections in 1993 restored a constitutional monarchy and began Cambodia's halting transition toward stability.

  7. Modern Cambodia

    1993 – present

    The restoration of the monarchy under King Sihanouk and subsequent coalition governments presided over gradual economic growth, though factional violence in 1997 briefly destabilized the country. The final Khmer Rouge elements surrendered in 1999, and UN-backed tribunals later prosecuted surviving leaders for crimes against humanity. Cambodia has since pursued integration into ASEAN and sustained development, even as concerns about democratic backsliding and single-party dominance persist.

Timeline Preview

The first 7 key events. View the full chronology on the timeline page.

  1. 1700

    Viets conquer Mekong Delta.

    Viets conquer Mekong Delta; weaker Khmer kingdom assumes roughly modern borders of Cambodia.

  2. 1834 – 1841

    Viets attack and share increasing control over Khmers with Siam kingdom.

    Viets attack and share increasing control over Khmers with Siam kingdom.

  3. 1863

    Cambodia becomes a protectorate of France. French colonial rule lasts for 90 years.

    Cambodia becomes a protectorate of France. French colonial rule lasts for 90 years.

  4. 1941 – 1945

    Cambodia is occupied by Japan during World War II.

    Cambodia is occupied by Japan during World War II.

  5. 1946

    France re-imposes its protectorate.

    France re-imposes its protectorate.

  6. 1953

    Cambodia wins its independence from France.

    Cambodia wins its independence from France. Under King Sihanouk, it becomes the Kingdom of Cambodia.

  7. 1965

    Head of State Sihanouk breaks off relations with the US.

    Head of State Sihanouk breaks off relations with the US and allows North Vietnamese guerrillas to set up bases in Cambodia in pursuance of their campaign against the US-backed government in South Vietnam.