US Involvement in Vietnam (WJEC Eduqas GCSE History): Revision Note

Exam code: C100

James Ball

Written by: James Ball

Reviewed by: Natasha Smith

Updated on

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Summary

When it appeared as if Vietnam was about to become an independent communist country after the Second World War, America helped finance France’s war to take back control of its former colony. 

After years of bloody fighting, France admitted defeat and withdrew from a Vietnam that was divided between a communist north and a capitalist south. America paid to support the deeply unpopular South Vietnamese leader Ngo Dinh Diem, who was coming under attack from communist guerrilla fighters that became known as the Viet Cong.

After US ships came under attack in 1964 in what became known as the Gulf of Tonkin incident, America became fully involved in the war to defeat the communist guerrillas and their supporters in North Vietnam. This involved an enormous aerial bombing campaign known as Operation Rolling Thunder and spraying millions of litres of poisonous chemicals over the jungles of Vietnam. American troops flew above the jungles in helicopters in pursuit of the Viet Cong fighters in ‘Search and Destroy’ missions.

Despite these tactics, sending enormous numbers of troops and spending billions of dollars, it was not enough to defeat the Viet Cong. In 1973, President Nixon signed the Paris Peace Accords, which he claimed brought ‘peace with honor’ and led to the withdrawal of American troops from Vietnam.

Without American support, South Vietnam was unable to defend itself and, within two years, had surrendered to the communist north. Vietnam became a unified communist country.

The Division of Vietnam

  • From the 18th century until the Second World War, Vietnam had been part of the French Empire

  • During World War II, France was conquered by Nazi Germany, and Japan invaded Vietnam

    • Japan stripped the region of its natural resources and took food to feed its own population

    • This resulted in nearly 2 million Vietnamese people starving to death

  •  The Vietnamese Independence League (or Vietminh) fought to free the country from Japanese control

    • The Vietminh was led by two communists, Ho Chi Minh and Nguyen Vo Giap

    • When Japan surrendered to America at the end of World War II, the Vietminh declared Vietnam to be an independent country and Ho Chi Minh its president

      • France refused to accept this and sent an army to recapture Vietnam, and fought a war against the Vietminh from 1946 to 1954

  • Between 1950 and 1954, the USA spent $3 billion supporting France in its war with the Vietminh

  • Over 80% of France’s weaponry and vehicles were supplied by America

  • However, a crushing defeat at the Battle of Dien Bien Phu led to the French Prime Minister resigning and the French Parliament voting to end the war

  • In 1954, the leaders of the USA, USSR, Britain, France, China and Vietnam all met in the Swiss city of Geneva to decide Vietnam’s future

    • This became known as the Geneva Agreement

  • Everyone agreed that elections should be held before July 1956 to choose a government for the whole of Vietnam

  • In the meantime, it was also agreed that Vietnam should be divided along the 17th parallel

    • The North was to be governed by Ho Chi Minh

    • The South was to be governed by Ngo Dinh Diem

Illustration comparing North Vietnam's Ho Chi Minh, respected and backed by the USSR, with South Vietnam's unpopular Ngo Dinh Diem, backed by the USA.
An illustration showing key information about the leaders of North and South Vietnam

The Diem regime 

  • Ngo Dinh Diem was to become the leader of South Vietnam because he was strongly anti-communist

  • However, he was also corrupt, introduced new taxes and crushed any opposition 

  • This made him deeply unpopular with many South Vietnamese people 

  • Many of Diem’s opponents came together to form the National Liberation Front (NLF) to remove him from power

  • The NLF took direct action:

    • They killed hundreds of people who worked in Diem’s government

  • Diem used the Army of the Republic of Vietnam (ARVN) to try to crush the NLF

  • The NLF took to the jungle to hide and then launched their attacks from there

    • The ARVN leaders called the NLF “Viet Nam Cong San”, which means Vietnamese communist

    • They were soon being called the Vietcong for short

The Viet Cong

  • From 1959 onwards, the Viet Cong were supported by North Vietnam and supplied with instructions and training, as well as weapons and equipment

    • This was delivered along supply routes that became known as the Ho Chi Minh Trail

      • The Ho Chi Minh Trail stretched from North Vietnam, through the neighbouring countries of Laos and Cambodia, before emerging in the jungles of South Vietnam

Map of Vietnam War era showing North and South Vietnam, Laos, and Cambodia. Red arrows indicate the Ho Chi Minh Trail; blue dots mark US Special Forces camps.
A map showing the Ho Chi Minh Trail

The Gulf of Tonkin incident 

  • The Gulf of Tonkin Incident was the key event that led to US troops fighting in Vietnam

  • It occurred in August 1964, when the US president was Lyndon Baines Johnson

  • Like Presidents Eisenhower and Kennedy before him, Johnson believed in the Domino Theory 

    • This was the idea that if one country became communist, its neighbouring country would soon do the same

    • America feared that if Vietnam turned communist, as China and North Korea had, it would lead to Laos, Cambodia, Thailand and India doing the same

Colourful dominoes labelled with Asian countries: China, Korea, Vietnam, Laos, Cambodia, Thailand, Malaya, Indonesia, Burma, India; toppling sequence.
Many Americans feared countries in South East Asia would fall to communism like a row of dominos
  • Like Eisenhower and Kennedy, Johnson also seemed reluctant to send American troops to Vietnam

    • All that changed after the Gulf of Tonkin incident

    • A US warship, USS Maddox, was torpedoed while supporting attacks on North Vietnam

    • The warship was hit, but no major damage was done

    • The event was enough to persuade Congress of aggression from North Korea

  • The Gulf of Tonkin Resolution meant that President Johnson was free to use the US military to defend South Vietnam — and attack North Vietnam — in whichever way he chose

Flowchart depicting events of the Gulf of Tonkin Incident in August 1964, including attacks, responses, USS Maddox involvement, and congressional actions.
A flowchart showing the Gulf of Tonkin Incident

Operation Rolling Thunder 

  • To cut off the Vietcong’s supplies, the US military targeted the supply routes and North Vietnam’s cities and factories with a sustained aerial bombing campaign called Operation Rolling Thunder

  • It began in March 1965 and continued until November 1968

    • During that time, nearly 900,000 tons of bombs were dropped on Vietnam

      • It is estimated that around 90,000 people were killed

  • Despite the enormous scale of the bombing, Operation Rolling Thunder was not as successful as the US had hoped

    • The Ho Chi Minh Trail was often just a dirt track and was easily repaired

    • The Vietcong built extensive underground bases and tunnel complexes that protected them from the bombing

    • It failed to break the resolve of the Vietcong or the North Vietnamese

    • Fear of bringing China directly into the conflict stopped the US from bombing North Vietnam’s ports

    • This meant that supplies, including jet fighters and air defence systems, continued to arrive in North Vietnam

    • Over 3,000 American war planes were shot down during the Vietnam War

Four military jets in formation release bombs over a landscape, with a clear sky above.
American aircraft dropping bombs on North Vietnam as part of Operation Rolling Thunder

Chemical Warfare 

  • To prevent the Vietcong from hiding in the dense jungle, the US launched Operation Ranch Hand from 1962 until 1971

    • This involved spraying millions of litres of herbicide or defoliant to kill the plants

      • This was intended to expose Vietcong trails and bases and destroy their food

    • Exposure to these chemicals led to birth defects for many years after the war had ended

Sign reading "Ranch Hand, Nha Trang Air Base" over a fenced entrance, with military aircraft visible in the background on a cloudy day.
An image of an aircraft which dropped millions of litres of toxic chemicals onto the jungles of Vietnam as part of Operation Ranch Hand

Search and Destroy

  • Like the French troops and Diem’s ARVN before them, the US soldiers struggled against the Vietcong’s guerrilla tactics

    • By operating in small groups and by not wearing uniforms, it was almost impossible for the Americans to tell who was a Vietcong fighter and who was a farmer

    • By patrolling through the jungle to find the Vietcong, US troops exposed themselves to booby traps and ambushes

    • US troops were being killed, but the Vietcong were not being found, let alone killed

  • In response, the US adopted search and destroy tactics

    • It built fortified bases all across South Vietnam from where it could launch search and destroy missions 

    • Travelling by helicopter, troops would suddenly descend on villages and search for evidence of the Vietcong

    • If they found Vietcong fighters, they would call for backup and order airstrikes

    • If they found weapons or food stores, they would burn down the villages

  • Search and destroy tactics were not successful

    • US troops were still killed by booby traps and ambushes when they left their helicopters

    • It led to an increase in support for the Vietcong as villagers resented having their homes destroyed

    • The Vietcong continued to escape the searches and would disappear into the jungle or across borders to foreign countries such as Laos and Cambodia

    • The Vietcong usually moved back and took control of an area once the US helicopters had left

Soldiers run from a landed helicopter as others hover above in a grassy field under a cloudy sky, depicting a military operation scene.
US soldiers on a search and destroy mission in South Vietnam in 1966

How did the War in Vietnam end?

  • President Richard Nixon was elected in 1968 after promising to bring about an “honourable peace” in Vietnam. 

    • His policy of Vietnamisation required South Vietnam’s soldiers to do more of the fighting against the Vietcong rather than alongside the US troops.

    • However, he also resumed heavy bombing raids on North Vietnam and ordered both US aircraft and soldiers to pursue the Vietcong into the neighbouring countries of Laos and Cambodia

      • Many Americans believed he was expanding the war rather than ending it, and protests erupted across the country

  • However, in January 1973, the governments of the USA, South Vietnam and North Vietnam signed the Paris Peace Accords

Key features of the Paris Peace Accords 

  • There would be an immediate ceasefire

  • Troops from both North and South Vietnam to stay in their current positions

  • All US troops were to leave Vietnam

  • All US prisoners of war were to be returned

  • Free and fair elections were to be held, and Vietnam was to be reunified in a peaceful and orderly manner

  • The US would continue to supply South Vietnam with weapons and equipment

Consequences of the Paris Peace Accords

  • Nixon claimed, “We believe that the agreement will bring peace with honor in Vietnam and Southeast Asia”

  • Other people claimed it was a humiliation and a betrayal of South Vietnam

    • North Vietnam still had a strong military and was determined to reunify Vietnam

    • Without US troops on the ground, some people believed that the defeat of South Vietnam by the communist North was inevitable

  • The agreed ceasefire quickly collapsed, and by March 1973, 6,000 Army of the Republic of Vietnam (ARVN) troops had been killed fighting the Vietcong 

    • Despite this, all US troops had left Vietnam within two months of the agreement being signed in Paris

  • In December 1974, North Vietnam tested America’s determination to support South Vietnam by invading and capturing a South Vietnamese province

    • When the USA did nothing to help the ARVN troops, the invasion continued

    • By April 1975, the capital city of Saigon had been captured by North Vietnam’s troops

    • On 30 April 1975, South Vietnam surrendered

  • The Vietnam War was over, and Vietnam was a united country with a communist government

Examiner Tips and Tricks

Question 5 on this paper will ask you how important an issue was in a particular event. You must explain and evaluate the importance of that issue, supporting it with specific factual details. You must then identify another important issue that relates to the same event and explain and evaluate its importance. Finally, you must reach a conclusion that is well-reasoned and supported as to which is the most important factor of the two.

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James Ball

Author: James Ball

Expertise: Content Creator

After a career in journalism James decided to switch to education to share his love of studying the past. He has over two decades of experience in the classroom where he successfully led both history and humanities departments. James is also a published author and now works full-time as a writer of history content and textbooks.

Natasha Smith

Reviewer: Natasha Smith

Expertise: History Content Creator

After graduating with a degree in history, Natasha gained her PGCE at Keele University. With more than 10 years of teaching experience, Natasha taught history at both GCSE and A Level. Natasha's specialism is modern world history. As an educator, Natasha channels this passion into her work, aiming to instil in students the same love for history that has fuelled her own curiosity.