The Indochina Wars were a series of conflicts in Southeast Asia from 1946 to 1989.
The major conflicts with global impact were the First Indochina War from 1946 to 1954 in which an independence movement supported by the Soviet Union and the People's Republic of China defeated French colonial forces, and the Vietnam War or American War in 1955-1975, in which North Vietnam (supported by the Soviet Union and China) defeated and annexed South Vietnam, which was supported by the United States and some of their allies.
There were other smaller parallel and later conflicts, within the region.
The wars in Indochina were extremely destructive, and their effects can still be felt today. As a comparison, in terms of tonnage, more bombs were dropped by the Americans on Southeast Asia during the course of the Indochina Wars, than the total amount of bombs dropped by all sides in all theatres of World War II combined. Landmines were also used extensively in the wars, the result being that to this day, locals continue to be killed or maimed by exploding landmines and bombs on a regular basis in Vietnam, Laos, Cambodia, and to a lesser extent, Thailand.
The Indochina Wars began as wars for independence from French colonial rule. They became part of the Cold War, which pitted the Western allies of the United States against the Soviet Union and China. They were also ideological conflicts between communism and capitalism. The communist camp was split into a pro-Soviet and a pro-Chinese faction in 1961, culminating in a war between the former "brother" nations in 1969.
In the late 19th century, France replaced Imperial China and Siam as the colonial power in the region that is today Vietnam, Laos and Cambodia. Japan occupied the entire region during World War II. When the Japanese were defeated, the French aimed to regain their colonies, but their allies, especially the U.S., were opposed. Laos and Cambodia gained their independence, but their governments soon faced revolts by local communists backed by Moscow and/or Beijing.
In Vietnam, things became much more complex. The Allies agreed that the Nationalist Chinese would administer the north of the country and the British the south until a Vietnamese government could be set up. Both countries had other problems — a civil war in China and a major Communist insurgency in Malaya — so neither did a good job in Vietnam. The Việt Minh, a Communist-dominated anti-colonial coalition backed by the Soviet Union, declared independence in the north, while the French regained control in the south. By 1947, the two were at war and after 1949, the Chinese Communist government gave the Việt Minh considerable support. The U.S. supported France, but President Dwight Eisenhower refused to send American troops. After the French suffered a humiliating defeat in the bloody Battle of Dien Bien Phu, the 1954 Geneva Accords ended that war.
The Geneva Accords again divided Vietnam, with the Việt Minh led by Ho Chi Minh controlling the north and the French the south, and provided for elections in 1956 to create a government for the whole country. The French turned power over to a United States-backed capitalist regime led by Ngo Dinh Diem in the south, but Diem refused to hold the elections, resulting in another war. Diem, who was a Roman Catholic, enacted discriminatory laws against the Buddhist majority, making him very unpopular among the citizenry of South Vietnam.
Although the accords specified that the military demarcation line was provisional and not a political boundary, the United States recognized South Vietnam as an independent country, and provided military and financial support. The pro-communist National Liberation Front of South Vietnam, colloquially known as Viet Cong (VC or "Charlie" in US military slang), did not recognize the Diem administration, which they viewed as an American puppet regime. Aided by the North Vietnamese People's Army, they fought for a re-unification of Vietnam under communist leadership and against the U.S. presence.
At first, the United States only provided arms and military advisors to South Vietnam; but after the 1963 "Gulf of Tonkin incident", President Lyndon B. Johnson sent thousands of American "boots on the ground". In the course of the war, more than 2.7 million U.S. soldiers fought in Vietnam. Despite the American forces' use of attack helicopters, napalm and "Agent Orange" defoliant, they were not able to rout the Viet Cong, who used guerilla tactics and benefited from their acquaintance with the rough terrain and support from parts of the civilian population. Both sides committed horrendous war crimes, most notably the Huế Massacre during the Tet Offensive, and the Mỹ Lai Massacre in 1968.
Following World War II, Thailand became a U.S. ally and an important forward base for U.S. operations in the Vietnam War. The Philippines, a former American colony that gained independence in 1946, also had important bases for the U.S. war effort, notably a naval base at Subic and Clark Air Base. Other regional U.S. partners included Australia, Japan, Malaysia, Singapore, South Korea, Taiwan and the then-British colony of Hong Kong. These areas also became officially-approved destinations for the R&R of American soldiers fighting in the war, thus boosting their tourism industries, though with the exception of Australia, also led to the growth of sex and vice tourism in those areas, especially in Thailand.
United by their fear of communism, the Association of Southeast Asian Nations (ASEAN) was formed as a de facto anti-communist grouping by Indonesia, Thailand, Malaysia, the Philippines and Singapore in 1967.
The Americans pulled their forces from South Vietnam in 1973 amid mounting losses and domestic pressures to end the war. The Vietnam War eventually ended with the Fall of Saigon on 30 April 1975, when a North Vietnamese tank drove into South Vietnam's Presidential Palace.
China fought a brief war with South Vietnam in 1974, gaining control of the Paracel Islands, which remain disputed between China, Taiwan and Vietnam.
Occurring concurrently with the Vietnam War was the Laotian Civil War (1959-1975), which pitted the French-aligned royal family, backed by the United States, Thailand and South Vietnam, against the communist Pathet Lao, backed by North Vietnam and the Soviet Union. Following the Fall of Saigon, and the consequent loss of South Vietnamese support for the royalists, the Pathet Lao won the civil war.
The Vietnam War had significant spillover into Laos and Cambodia, first through the "Ho Chi Minh trail" that was used by North Vietnamese smugglers to supply South Vietnamese communist forces and later when U.S. President Richard Nixon decided to bomb those countries that had been officially neutral up to that point, which led to Laos becoming the "most bombed country in history".
The horror, however, was not over yet. After the communist victory, many of the ethnic Chinese and business-owning upper and middle class Vietnamese in the South were targeted for purges. This sparked off a massive refugee crisis as many Southerners, known as the "boat people", attempted to flee the country, with countless refugees perishing at sea. Most of the survivors were settled in the United States, Australia and Canada, thus establishing the Vietnamese communities in those countries. Likewise, the Hmong people of Laos came under general suspicion by the victorious communists of being pro-American collaborators, leading to a mass exodus of that ethnic group to Thailand, the U.S. and other Western countries.
In the course of the war and chaos, Cambodia was first destabilized by a coup in 1970, then the country was taken over by the "Khmer Rouge", as they came to be known in the West, under Pol Pot. Driven by a particularly extremist interpretation of communist doctrine combined with Khmer ethnic nationalism, they overthrew the U.S.-backed Khmer Republic in 1975, and perpetrated one of the most horrific genocides in history, killing roughly a quarter of the Cambodian population. Large numbers of middle and upper class Cambodians attempted to flee by sea while many others fled over the borders with Thailand and Vietnam, thus worsening the already bad refugee crisis brought on by the Fall of Saigon. The West supported the regime despite its professed communism (being pro-China and anti-Soviet, they were seen as the lesser evil in the cynical logic of the Cold War). It was the Vietnamese army that intervened in 1978/79, stopped the genocide and toppled the Khmer Rouge regime. In retaliation, China invaded Vietnam in 1979, but withdrew shortly after. The Sino-Vietnamese war led to an intensification of the purges of Vietnam's ethnic Chinese, with virtually the entire ethnic Chinese population in northern Vietnam expelled to China. A significant ethnic Chinese community remains in southern Vietnam, albeit in much smaller numbers than prior to the Fall of Saigon.
Vietnamese forces only withdrew from Cambodia under pressure from ASEAN in 1989, which was followed by a normalisation of Sino-Vietnamese ties in 1991, and the final demarcation of the China-Vietnam land border being completed in 2008. In Cambodia, stability was restored in 1993 with the restoration of a constitutional monarchy, and the successful conduct of elections under the oversight of the United Nations.
Following the end of the Cold War, all three countries that made up the former French Indochina were admitted into ASEAN. Vietnam and the U.S. have cordial relations today.
There is considerable tourism by foreign veterans returning to visit the countries where they served or that they visited for R&R. Some even retire there; Thailand, the Philippines, Vietnam and Cambodia all have substantial contingents of retirees including some veterans.
The region is also a popular backpacker destination; see Banana Pancake Trail. Relations between all countries in the region are now peaceful, and the route from Bangkok to Ho Chi Minh City overland is popular among Western backpackers.
Hong Kong was a British colony during the Indochina Wars, and the British military bases there were used as staging points for American forces during the Vietnam War. All British forces left Hong Kong following its return to China in 1997, and the military bases were handed over to the Chinese military. After the Fall of Saigon, many of the Cantonese-speaking ethnic Chinese from South Vietnam fled to Hong Kong as refugees and eventually settled there, and some, such as Ray Lui and Tsui Hark, went on to successful careers in Hong Kong's entertainment industry.
The US had two important bases in the Philippines at this time, though both were shut down in the 1990s. Nevertheless, the Philippines remains an official U.S. ally. Many US veterans have since retired in the country, though most say the base areas "ain't what they used to be".
During the Vietnam War, the United States formally recognized the Republic of China (ROC) on Taiwan as the sole legitimate government of all of China, and did not have diplomatic relations with the People's Republic of China (PRC) on the mainland. Accordingly, the island was home to numerous U.S. military bases that were used as staging points during the Vietnam War, and was also an approved destination for American soldiers on their R&R leaves. These military bases were abandoned, and all U.S. forces were withdrawn following the switch of diplomatic recognition to the PRC in 1979. Taiwan's status as an official U.S. ally was reinstated in 2003, though it would not be until 2020 that the U.S. would once again establish a permanent military presence in Taiwan.
Thailand was the most important U.S. ally in Southeast Asia during the Vietnam War, and home to several U.S. forward bases for troops about to be deployed to the battlefield in Vietnam. Thailand itself also fought a communist insurgency from 1965 to 1983, but unlike in the former French Indochina, the Thai communists failed to make any significant gains, partly due to the immense popularity of then-king Bhumibol Adulyadej among the Thai people. Thailand's famous sex tourism industry largely traces its roots to the Vietnam War, when it sprung up to cater to the American soldiers who were stationed in Thailand and/or visiting Thailand on their R&R leaves. Following the U.S. withdrawal from Vietnam, Thailand expelled the remaining U.S. military forces from Thai soil, though it remains an official U.S. ally and regularly conducts bilateral military exercises with the U.S. Thailand's thriving sex tourism industry also remains as a reminder of that bygone era.
The wars continue to be a sensitive topic for the generations that lived through them, so tread carefully when discussing them with locals. In particular, cultural differences between northern and southern Vietnam persist as a result of the previous division, and some Southerners in Vietnam are still bitter about having lost against the North. Most locals bear no animosity against individual tourists from the countries that participated in the wars, however, and American visitors can expect a warm welcome as most younger locals born after the wars admire American culture.
While Cambodia and Laos have developed close relations with China, relations between Vietnam and China continue to be tense due to unresolved maritime border disputes, so tread carefully when discussing Sino-Vietnamese relations with locals. China is now the largest source of international tourists for all three countries, though, and apart from the odd jibe against the Chinese government, visitors from China are unlikely to run into any major issues as long as they are respectful and avoid political discussions.
Much of the region is still littered with land mines and unexploded ordnance, so be sure to avoid going off the beaten track in rural areas unless you have a guide who knows the area well.