Mekong Delta
The Mekong Delta, also known as the South-western Region or the Western Region, is the region in southwestern Vietnam where the Mekong River approaches and empties into the sea through a network of distributaries. The Mekong delta region encompasses a large portion of south-western Vietnam, of an area of over. The size of the area covered by water depends on the season. Its wet coastal geography makes it an important source of agriculture and aquaculture for the country.
The delta has been occupied as early as the 4th century BC. As a product of Khmer, Vietnamese, Chinese, and French settlement in the region, the delta and its waterways have numerous names, including the Khmer term Bassac to refer to the lower basin and the largest river branch flowing through it. After the 1954 Geneva Conference, Vietnam was split into two with South Vietnam inheriting the southern half of Vietnam becoming the State of Vietnam and eventually the Republic of Vietnam, also known as South Vietnam, with their own administrative states. After 1975, the Mekong Delta ceased being a part of the Republic of Vietnam, succeeded by the current Vietnamese nation. The region comprises 4 provinces: Đồng Tháp, An Giang, Vĩnh Long, and Cà Mau, along with the province-level municipality of Cần Thơ.
The Mekong Delta has been dubbed a "biological treasure trove". Over 1,000 animal species were recorded between 1997 and 2007 and new species of plants, fish, lizards, and mammals have been discovered in previously unexplored areas, including the Laotian rock rat, thought to be extinct. The low-lying coastal geography of the region makes it vulnerable to climate change caused sea level rise, alongside related issues such as coastal erosion and saltwater intrusion.
History
Funan and Chenla period
The Mekong Delta was likely inhabited long since prehistory with the civilizations of Funan and Chenla maintaining a presence in the Mekong Delta for centuries. Archaeological discoveries at Óc Eo and other Funanese sites show that the area was an important part of the Funan civilization, bustling with trading ports and canals as early as in the first century AD and extensive human settlement in the region may have gone as far back as the 4th century BC. While there is no clear consensus on the ethnic makeup of those living in the region during the Funan, archaeologists suggest that they may have had connections to Austroasiatic people. Khmer inscriptions appear during the Chenla period.Angkor Borei is a site in the Mekong Delta that existed between 400 BC-500 AD. This site had extensive maritime trade networks throughout Southeast Asia and with India, and is believed to have possibly been the ancient capital to the civilization of Funan.
Champa incursions
In the early 15th century, Champa began mounting several incursions in the Mekong Delta. The declining Kingdom of Cambodia asked the Chinese Ming Empire for intervention in 1408 and 1414. Despite that, in 1421 Indravarman VI of Champa seized and annexed the eastern part of the Mekong Delta, including the marketplace town of Biên Hòa. He installed a statue of Tribhuvanākrānta there to mark the southern most extent of Champa. In 1757, Vietnamese lords had acquired control of Cà Mau. By the 1860s, French colonists had established control over the Mekong Delta and established the colony of French Cochinchina.Vietnamese period
The Vietnamese acquisition of the Mekong Delta can be divided into two phases:Marriage agreement and interventions
In 1621, Lord Nguyễn Phúc Nguyên arranged a contract marriage between his daughter Nguyễn Phúc Ngọc Vạn and Cambodian king Chey Chettha II in exchange to the establishment of a Vietnamese trade port in town of Prei Nokor and tax exemptions for Vietnamese settlers moving into the area. Vice versa, the Nguyễn will help Cambodia politically and militarily to counter against Ayutthaya Kingdom pressures. Earliest Vietnamese settlements in the Mekong Delta appeared and centered around Đồng Nai and Mỗi Xoài.In 1658, without any excuses, the Nguyễn invaded Cambodia and deposed the only Khmer Muslim king Ramathipadi I. 16 years later, the Nguyễn again militarily interfered Cambodian internal royal affairs, putting Prince Ang Nan into power. The Nguyễn invited fleeing Chinese refugees to settle in Mekong River entrance towns of Mỹ Tho and Biên Hoà In 1688, the Chinese revolted against Nguyễn lords. King Ang Nan died in 1691, and the revolt was soon resolved.
After fully subjugating Champa in 1697, the Nguyễn lords sent marquis Nguyễn Hữu Cảnh and a small expedition to annex Prei Nokor, renamed it to Gia Định, establishing Vietnamese administrative structures, and explore deep into the lower Mekong Delta from Mỹ Tho to An Giang. King Chey Chettha IV of Cambodia tried to stop the Vietnamese but was defeated by Nguyễn Hữu Cảnh in 1700. In February 1700, he invaded Cambodia from An Giang. In March, the Vietnamese expedition under Cảnh and a Chinese general Trần Thượng Xuyên defeated the main Cambodian army at Bích Đôi citadel, king Chey Chettha IV took flight while his nephew Ang Em surrendered to the invaders as the Vietnamese captured Phnom Penh. As a result, Saigon and Long An were officially obtained by the Nguyễn, more Vietnamese settlers moved into the new conquered lands. In 1708, Mạc Cửu of Hà Tiên also pledged loyalty to the Nguyễn lords.
Conquest of the Mekong Delta
In the 18th century, the edges of the Mekong Delta bordering with Cambodia had been mainly inhabited by isolated communities of Shafi'i Chams and Islamic Cham–Malays collectively known as the Cham Barw or Côn Man by Vietnamese sources, while most of the Delta remained under Cambodian control. Under the reign of king Chey Chettha V, in 1750 he began subduing and persecuting the Cham–Malay Muslims, who at the time were close allies of the Nguyễn lords. Using that pretext, Lord Nguyễn Phúc Khoát launched a full-scale invasion of Cambodia in 1754, with the army under the command of general Nguyễn Cư Trinh. 10,000 Vietnamese troops divided into two groups, rolled into Cambodia and completely flattened Cambodian resistance and easily captured its capital Phnom Penh in summer of 1754. King Chey Chettha V fled to Longvek.The Muslims rose up and joined the Vietnamese chasing the Cambodians. Due to heavy spring rain, the Muslim segment lost contact with the main army of Nguyễn Cư Trinh, and were surrounded by 10,000 Cambodians at Vô Tà Ân in early 1755. Muslim troops piled carts and wagons into a defensive perimeter and stood their ground against Cambodian attacks until being relieved by Nguyễn Cư Trinh. With the help of mediation by Mạc Thiên Tứ of Hà Tiên, a ceasefire agreement was reached between King Chey Chettha V and Lord Nguyễn Phúc Khoát in 1756: Cambodia ceded Gò Công and Tân An to the Vietnamese, Chey Chettha V was deposed, while Ang Tong was restored as King of Cambodia. Ang Tong offered the Nguyễn two districts of Trà Vinh and Ba Thắc as tributes.
In 1757, Ang Tong died and was succeeded Outey II. With the help of the Nguyễn Lords and the Principality of Hà Tiên, Outey II regained the throne from usurpers. He gave all remaining Mekong Delta lands to Mạc Thiên Tứ, and Mạc Thiên Tứ swapped all these areas to the Nguyễn in exchange for the Mạc clan's total autonomy in Hà Tiên. The new lands were divided into two districts: Rạch Giá and Cà Mau. By 1757, all of today's Mekong Delta including the Cape Cà Mau firmly came under Vietnamese control.
Nguyễn dynasty, French and modern period
In 1802 Nguyễn Ánh crowned himself emperor Gia Long and unified all the territories comprising modern Vietnam, including the Mekong Delta.Upon the conclusion of the Cochinchina Campaign in the 1860s, the area became part of Cochinchina, France's first colony in Vietnam, and later, part of French Indochina. Beginning during the French colonial period, the French patrolled and fought on the waterways of the Mekong Delta region with their Divisions navales d'assaut , a tactic which lasted throughout the First Indochina War, and was later employed by the US Navy Mobile Riverine Force. During the Vietnam War—also referred to as the Second Indochina War—the Delta region saw savage fighting between Viet Cong guerrillas and the US 9th Infantry Division and units of the United States Navy's swift boats and hovercraft plus the Army of the Republic of Vietnam 7th, 9th, and 21st Infantry Divisions. As a military region the Mekong Delta was encompassed by the IV Corps Tactical Zone.
In 1975, North Vietnamese soldiers and Viet Cong soldiers launched a massive invasion in many parts of South Vietnam. While I, II, and III Corps collapsed significantly, IV Corps was still highly intact due to under Major General Nguyễn Khoa Nam overseeing strong military operations to prevent VC taking over any important regional districts. Brigadier General Lê Văn Hưng, the head of 21st Division commander, stayed office in Cần Thơ to continue defending successfully against VC. On 29 April 1975, the last U.S. Consul General Terry McNamara and his diplomats evacuated by marine boat from Cần Thơ to the South China Sea. When the South Vietnamese President Dương Văn Minh ordered unconditional surrender, both ARVN generals in Cần Thơ, General Lê Văn Hưng and Nguyễn Khoa Nam, committed suicide. At Binh Thuy Air Base some ARVN soldiers and air base personnel who defended the air base were evacuated by helicopters and several jet fighters to Thailand shortly after hearing Minh's surrender. Within hours, VC soldiers occupied the base and captured those ARVN and air base personnel who didn't escape. In Mỹ Tho, Brigadier General Trần Văn Hai, who was in charged protecting National Highway 4 from Saigon to Cần Thơ, committed suicide. Tran was one of the three ARVN generals who refused to be evacuated by American forces when the North Vietnamese soldiers invaded Saigon. Several ARVN soldiers continued to fight against the VC but later either surrendered or disbanded when faced with VC counterattacks.
In the late 1970s, the Khmer Rouge regime attacked Vietnam in an attempt to reconquer the Delta region. This campaign precipitated the Vietnamese invasion of Cambodia and subsequent downfall of the Khmer Rouge.