Cambodian coup of 1970
Encyclopedia
The Cambodian coup of 1970 refers to the removal of the Cambodia
Cambodia
Cambodia , officially known as the Kingdom of Cambodia, is a country located in the southern portion of the Indochina Peninsula in Southeast Asia...

n Head of State, Prince Norodom Sihanouk
Norodom Sihanouk
Norodom Sihanouk regular script was the King of Cambodia from 1941 to 1955 and again from 1993 until his semi-retirement and voluntary abdication on 7 October 2004 in favor of his son, the current King Norodom Sihamoni...

, after a vote in the National Assembly on 18 March 1970. Emergency powers were subsequently invoked by the Prime Minister Lon Nol
Lon Nol
Lon Nol was a Cambodian politician and general who served as Prime Minister of Cambodia twice, as well as serving repeatedly as Defense Minister...

, who became effective head of state. The coup led ultimately to the proclamation of the Khmer Republic
Khmer Republic
The Khmer Republic or République Khmère, was the republican government of Cambodia that was formally declared on October 9, 1970. The Khmer Republic was disestablished in 1975 and was followed by the totalitarian communist state known as Democratic Kampuchea.-Background:Formally declared on October...

(République khmère) later that year, and was a turning point in the Cambodian Civil War
Cambodian Civil War
The Cambodian Civil War was a conflict that pitted the forces of the Communist Party of Kampuchea and their allies the Democratic Republic of Vietnam and the Viet Cong against the government forces of Cambodia , which were supported by the United States and the Republic of Vietnam The Cambodian...

. Not a monarchy any longer, Cambodia received the semi-official appellation "État du Cambodge" (State of Cambodia) in the intervening six months after the coup, until the republic was proclaimed.

It also marked the point at which Cambodia became substantially involved in the Second Indochina War, as Lon Nol issued an ultimatum to Vietnamese forces to leave Cambodia.

Background

Since independence from France
France
The French Republic , The French Republic , The French Republic , (commonly known as France , is a unitary semi-presidential republic in Western Europe with several overseas territories and islands located on other continents and in the Indian, Pacific, and Atlantic oceans. Metropolitan France...

 in 1954, Cambodia
Cambodia
Cambodia , officially known as the Kingdom of Cambodia, is a country located in the southern portion of the Indochina Peninsula in Southeast Asia...

 had been led by Prince Norodom Sihanouk
Norodom Sihanouk
Norodom Sihanouk regular script was the King of Cambodia from 1941 to 1955 and again from 1993 until his semi-retirement and voluntary abdication on 7 October 2004 in favor of his son, the current King Norodom Sihamoni...

, whose Sangkum
Sangkum
The Sangkum Reastr Niyum , commonly known simply as the Sangkum, was a political organisation set up in 1955 by Prince Norodom Sihanouk of Cambodia...

 political movement had retained power after winning the 1955 parliamentary election
Cambodian parliamentary election, 1955
The first parliamentary elections in Cambodia were held in 1955. The elections were held following the peace established at the 1954 Geneva Conference and the independence of the country. The election were postponed to September 1955...

. In 1963, Sihanouk had forced the National Assembly to approve a constitutional amendment that made him head of state with no fixed term of office. He had retained domestic power through a combination of political manipulation, intimidation, patronage, and careful balancing of left- and right-wing elements within his government; whilst placating the right with nationalist rhetoric, he appropriated much of the language of socialism
Socialism
Socialism is an economic system characterized by social ownership of the means of production and cooperative management of the economy; or a political philosophy advocating such a system. "Social ownership" may refer to any one of, or a combination of, the following: cooperative enterprises,...

 to marginalize the Cambodian communist movement, who he proprietorially referred to as the Khmers Rouges
Khmer Rouge
The Khmer Rouge literally translated as Red Cambodians was the name given to the followers of the Communist Party of Kampuchea, who were the ruling party in Cambodia from 1975 to 1979, led by Pol Pot, Nuon Chea, Ieng Sary, Son Sen and Khieu Samphan...

("Red Khmers").

With the Second Indochina War escalating, Sihanouk's balancing act between left and right became harder to maintain. Cross-border smuggling of rice also began to have a serious effect on the Cambodian economy. In the Cambodian elections of 1966, the usual Sangkum policy of having one candidate in each electoral district was abandoned; there was a huge swing to the right, especially as left-wing deputies had to compete directly with members of the traditional elite, who were able to use their local influence. Although a few communists within the Sangkum - such as Hou Yuon
Hou Yuon
Hou Yuon was a veteran of the communist movement in Cambodia, and was of Sino-Khmer descent. A member of the Communist Party of Kampuchea, also known as the Khmer Rouge, he served in several ministerial posts during the 1960s and 1970s.Yuon, who repeatedly clashed with other members of the Khmer...

 and Khieu Samphan
Khieu Samphan
Khieu Samphan was the president of the state presidium of Democratic Kampuchea from 1976 until 1979. As such, he served as Cambodia's head of state and was one of the most powerful officials in the Khmer Rouge movement, though Pol Pot was the group's true political leader and held the most...

 - chose to stand, most leftists were decisively defeated. Lon Nol, a rightist who had been a longstanding associate of Sihanouk, became Prime Minister.

By 1969, Lon Nol and the rightists were growing increasingly frustrated with Sihanouk. Although the basis for this was partly economic, political considerations were also involved. In particular, the nationalist and anti-communist sensibilities of Lon Nol and his associates meant that Sihanouk's policy of semi-toleration of Viet Cong and Vietnam People's Army
Vietnam People's Army
The Vietnam People's Army is the armed forces of Vietnam. The VPA includes: the Vietnamese People's Ground Forces , the Vietnam People's Navy , the Vietnam People's Air Force, and the Vietnam Marine Police.During the French Indochina War , the VPA was often referred to as the Việt...

 activity within Cambodian borders was unacceptable; Sihanouk, during his swing to the left in 1963-66, had negotiated a secret arrangement with Hanoi
Hanoi
Hanoi , is the capital of Vietnam and the country's second largest city. Its population in 2009 was estimated at 2.6 million for urban districts, 6.5 million for the metropolitan jurisdiction. From 1010 until 1802, it was the most important political centre of Vietnam...

 whereby in return for the guaranteed purchase of rice at inflated prices, the port of Sihanoukville
Sihanoukville
Sihanoukville , also known as Kampong Saom, is a province in southern Cambodia on the Gulf of Thailand. This port city is a growing Cambodian urban center, located southwest of the Cambodian capital, Phnom Penh. The province is named after King Father Norodom Sihanouk and grew up around the...

 was opened for weapons shipments to the Viet Cong. As well as the rightist nationalists, the liberal modernising elements within the Sangkum, headed by In Tam
In Tam
In Tam was a former Prime Minister of Cambodia. He served in that position from May 6, 1973 to December 9 1973, and had a long career in Cambodian politics.-Political career:...

, had also become increasingly alienated by Sihanouk's autocratic style.

There is evidence that during 1969 Lon Nol approached the US military establishment to gauge military support for any action against Sihanouk. Lon Nol's appointee as deputy Prime Minister, Prince Sisowath Sirik Matak
Sisowath Sirik Matak
Prince Sisowath Sirik Matak was a member of the Cambodian royal family, the Varman dynasty.Sirik Matak was mainly notable for his involvement in Cambodian politics, particularly for his involvement in the 1970 right-wing coup against his cousin, Prince Norodom Sihanouk, and for his subsequent...

 - a US-friendly nationalist and leader of the Cambodian business community - is thought to have suggested that Sihanouk should be assassinated, though Lon Nol rejected this plan as "criminal insanity". Sihanouk himself thought that Sirik Matak (who he characterised as a jealous rival claimant to the Cambodian throne) backed by the CIA, and in contact with exiled Sihanouk opponent Son Ngoc Thanh
Son Ngoc Thanh
Son Ngoc Thanh was a Cambodian nationalist and republican policitian, with a long history as a rebel and a government minister.-Early life:...

, had suggested the coup plan to Lon Nol in 1969. CIA involvement in the coup plot remains unproven, and Henry Kissinger
Henry Kissinger
Heinz Alfred "Henry" Kissinger is a German-born American academic, political scientist, diplomat, and businessman. He is a recipient of the Nobel Peace Prize. He served as National Security Advisor and later concurrently as Secretary of State in the administrations of Presidents Richard Nixon and...

 later claimed that events would take the US government by surprise, but it seems likely that at least some military intelligence agents were partly culpable. It is also known that the US military had drawn up plans for an invasion of Cambodia in 1966-7, and were upset that Lyndon B. Johnson
Lyndon B. Johnson
Lyndon Baines Johnson , often referred to as LBJ, was the 36th President of the United States after his service as the 37th Vice President of the United States...

 would not approve them.

Declassified documents indicate that, as late as March 1970, the Nixon administration was hoping to garner "friendly relations" with Sihanouk.

Sihanouk Deposed as Head of State

In March 1970, while Sihanouk was touring Europe, the Soviet Union
Soviet Union
The Soviet Union , officially the Union of Soviet Socialist Republics , was a constitutionally socialist state that existed in Eurasia between 1922 and 1991....

 and China
People's Republic of China
China , officially the People's Republic of China , is the most populous country in the world, with over 1.3 billion citizens. Located in East Asia, the country covers approximately 9.6 million square kilometres...

, large-scale anti-Vietnamese demonstrations erupted in Phnom Penh
Phnom Penh
Phnom Penh is the capital and largest city of Cambodia. Located on the banks of the Mekong River, Phnom Penh has been the national capital since the French colonized Cambodia, and has grown to become the nation's center of economic and industrial activities, as well as the center of security,...

. Crowds attacked the North Vietnamese and Viet Cong (Provisional Revolutionary Government of the Republic of South Vietnam) embassies. Sihanouk initially gave a certain degree of support to the demonstrators; he hoped Moscow and Beijing would pressure North Vietnam to reduce its presence in Cambodia. Indeed, it has even been suggested (by William Shawcross
William Shawcross
William Hartley Hume Shawcross, CVO is a British writer and commentator.-Career:Shawcross was educated at St. Aubyns Preparatory School, Rottingdean, Eton College and University College, Oxford. He attended St. Martin's Art School to study sculpture after leaving Oxford. He worked as a journalist...

 and others) that Sihanouk and Lon Nol may have planned the first demonstrations to gain political leverage against Hanoi
Hanoi
Hanoi , is the capital of Vietnam and the country's second largest city. Its population in 2009 was estimated at 2.6 million for urban districts, 6.5 million for the metropolitan jurisdiction. From 1010 until 1802, it was the most important political centre of Vietnam...

.

The riots, however, escalated beyond the government's control - although this was likely done with a degree of encouragement from Lon Nol and Sirik Matak - and the embassy was sacked. Inside, a "contingency plan" was allegedly found for the communists to occupy Cambodia. On 12 March, Sirik Matak cancelled Sihanouk's trade agreement with North Vietnam; Lon Nol closed the port of Sihanoukville to the North Vietnamese and issued an impossible ultimatum to them: all PAVN (People's Army of Vietnam aka. North Vietnamese Army) and NLF (National Liberation Front aka. Viet Cong) forces were to withdraw from Cambodian soil within 72 hours (on 15 March) or face military action. When, by the morning of March 16, it was clear that this demand had not been met, some 30,000 youths gathered outside the National Assembly in Phnom Penh to protest against the Vietnamese presence.

From this point, events were to move with increasing rapidity. On the same day, the Cambodian Secretary of State for Defence, Colonel Oum Mannorine (Sihanouk's brother-in-law), was scheduled to be questioned by the national legislature on allegations of corruption; the proceedings were adjourned to hear the demonstrators' resolutions. According to Sihanouk, Mannorine had received information that Lon Nol and Sirik Matak were about to precipitate a coup; a group of Mannorine's men, under the command of Phnom Penh's Chief of Police Major Buor Horl, attempted to arrest the plotters, but it was by then too late. Mannorine, and other key security personnel loyal to Sihanouk, were placed under arrest. After the Assembly adjourned for the day, Sihanouk's mother Queen Kossamak, at Sihanouk's request, summoned Lon Nol and Sirik Matak to the Royal Palace and asked them to end the demonstrations.

It appears to have been sometime during 16 or 17 March that Sirik Matak finally swayed Lon Nol to remove Sihanouk from the government. Lon Nol, who until that point may have been merely hoping that Sihanouk would end his relations with North Vietnam, showed some reluctance to take action against the Head of State: to convince him, Sirik Matak allegedly played him a tape-recorded press conference from Paris
Paris
Paris is the capital and largest city in France, situated on the river Seine, in northern France, at the heart of the Île-de-France region...

, in which Sihanouk threatened to execute them both on his return to Phnom Penh. However, the Prime Minister remained uncertain, with the result that Sirik Matak, accompanied by three army officers, finally compelled a weeping Lon Nol to sign the necessary documents at gunpoint.

The next day - 18 March - the army took up positions around the capital, and a debate was held within the National Assembly under In Tam's direction. One member of the Assembly (Kim Phon, later to be killed by pro-Sihanouk demonstrators in Kompong Cham) walked out of the proceedings in protest, though was not harmed at the time. The rest of the assembly voted unanimously to invoke Article 122 of the Cambodian constitution, which withdrew confidence in Sihanouk. Lon Nol took over the powers of the Head of State on an emergency basis, while the position itself was taken by the President of the General Assembly, Cheng Heng
Cheng Heng
Cheng Heng was a Cambodian politician, who acted as the country's Head of State from 1970–1971, and was a relatively prominent political figure during the Khmer Republic period ....

. In Tam was confirmed as President of the Sangkum
Sangkum
The Sangkum Reastr Niyum , commonly known simply as the Sangkum, was a political organisation set up in 1955 by Prince Norodom Sihanouk of Cambodia...

. The coup had, therefore, followed essentially constitutional forms rather than being a blatant military takeover. These events marked the foundation of the Khmer Republic
Khmer Republic
The Khmer Republic or République Khmère, was the republican government of Cambodia that was formally declared on October 9, 1970. The Khmer Republic was disestablished in 1975 and was followed by the totalitarian communist state known as Democratic Kampuchea.-Background:Formally declared on October...

.

Demonstrations against the coup

On March 23, Sihanouk (via Beijing
Beijing
Beijing , also known as Peking , is the capital of the People's Republic of China and one of the most populous cities in the world, with a population of 19,612,368 as of 2010. The city is the country's political, cultural, and educational center, and home to the headquarters for most of China's...

 Radio) called for a general uprising against Lon Nol. Large-scale popular demonstrations calling for Sihanouk's return began in Kompong Cham, Takéo Province, and Kampot Province. The demonstrations in Kompong Cham became particularly violent, with two National Assembly deputies, Sos Saoun and Kim Phon, being killed by demonstrators on 26 March after driving to the town to negotiate. Lon Nol's brother, police official Lon Nil
Lon Nil
Lon Nil was the brother of Cambodian Prime Minister Lon Nol, and was a casualty of the Cambodian coup of 1970.Nil was the youngest son of Lon Hin, a district administrator in the French colonial era. Like his brother Lon Nol, he was educated at the Lycée Chasseloup-Laubat in Saigon, and like the...

, was set upon in the nearby town of Tonle Bet by plantation workers and was also killed.

The demonstrations were suppressed with extreme brutality by the Cambodian army; there were several hundred deaths and thousands of arrests. Some witnesses spoke of tanks being used against crowds of unarmed civilians.

Aftermath

While Lon Nol initially continued dialogue with the North Vietnamese, who hoped to renegotiate their agreements, the American and South Vietnamese invasion of south-eastern Cambodia in the Cambodian Campaign of the following month was to radically and irrevocably alter Cambodia's involvement in the Second Indochina War. The brutality of the Lon Nol regime is often cited as a factor in the rise of the Khmer Rouge
Khmer Rouge
The Khmer Rouge literally translated as Red Cambodians was the name given to the followers of the Communist Party of Kampuchea, who were the ruling party in Cambodia from 1975 to 1979, led by Pol Pot, Nuon Chea, Ieng Sary, Son Sen and Khieu Samphan...

 due to increased anti-rightist and anti-American sentiment among the Cambodian people.

Numerous nations cut off ties with Cambodia because they only recognised the ousted Royal Government.

See also

  • Khmer Republic
    Khmer Republic
    The Khmer Republic or République Khmère, was the republican government of Cambodia that was formally declared on October 9, 1970. The Khmer Republic was disestablished in 1975 and was followed by the totalitarian communist state known as Democratic Kampuchea.-Background:Formally declared on October...

  • First Indochina War
    First Indochina War
    The First Indochina War was fought in French Indochina from December 19, 1946, until August 1, 1954, between the French Union's French Far East...

  • Cambodian Civil War
    Cambodian Civil War
    The Cambodian Civil War was a conflict that pitted the forces of the Communist Party of Kampuchea and their allies the Democratic Republic of Vietnam and the Viet Cong against the government forces of Cambodia , which were supported by the United States and the Republic of Vietnam The Cambodian...

  • Laotian Civil War (also referred to as the Laotian Secret War)
  • Vietnam War
    Vietnam War
    The Vietnam War was a Cold War-era military conflict that occurred in Vietnam, Laos, and Cambodia from 1 November 1955 to the fall of Saigon on 30 April 1975. This war followed the First Indochina War and was fought between North Vietnam, supported by its communist allies, and the government of...

     (also referred to as the Second Indochina War)
  • 1997 Cambodian Coup
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