The Vietnam War became one of the most controversial and devastating conflicts of the twentieth century. Although the conflict had deep roots in Vietnamese nationalism and the struggle against foreign rule, the developing Cold War transformed Vietnam into a major confrontation between communism and anti-communism.

From the early 1960s, the United States dramatically increased its involvement. Presidents Lyndon B. Johnson and Richard Nixon played particularly important roles in escalating, managing and eventually withdrawing American forces.

However, the United States faced a determined enemy. The North Vietnamese government and the Viet Cong used guerrilla warfare, political organisation and support from communist allies to resist American intervention.

The conflict also transformed American society. Television brought images of the war into people’s homes, while the military draft created widespread opposition. Events such as the Tet Offensive, the Pentagon Papers and the Kent State shootings further damaged public confidence in the war.

Ultimately, the United States withdrew its forces in 1973. Two years later, North Vietnamese forces captured Saigon, and Vietnam became a unified communist state.

This guide examines the causes of the Vietnam War, America’s escalation, the Tet Offensive, Nixon’s policy of Vietnamisation, the war’s domestic impact and its significance within the wider Cold War.

Vietnam War: What You Need to Know

Period: 1955–1975, with major US escalation from 1963–1969
Main sides: 
North Vietnam and Viet Cong vs South Vietnam and its allies
Key US presidents: 
Lyndon B. Johnson and Richard Nixon
Key events: 
Gulf of Tonkin, Tet Offensive, Vietnamisation and Paris Peace Accords
Major turning point: 
Tet Offensive, 1968
US withdrawal: 
1973
Fall of Saigon: 
1975
Overall significance: 
The war exposed the limits of American military power and had major consequences for US foreign policy.

Table of Contents

1. What Was the Vietnam War?
2. Why Was Vietnam Divided?
3. What Caused the Vietnam War?
4. Why Did the United States Intervene?
5. The Gulf of Tonkin Incident
6. The Gulf of Tonkin Resolution
7. Escalation Under Lyndon B. Johnson
8. Guerrilla Warfare and the Viet Cong
9. Operation Rolling Thunder
10. The Tet Offensive
11. Why Was Tet a Turning Point?
12. Nixon and Vietnamisation
13. Cambodia, Laos and the Expansion of the War
14. Kent State Shootings
15. Paris Peace Accords
16. Fall of Saigon
17. Why Did the United States Fail in Vietnam?
18. The Impact on American Society
19. The Pentagon Papers and Public Trust
20. The Vietnam War and the Cold War
21. The Vietnam Syndrome
22. Was the Vietnam War a Failure for the United States?
23. Key Questions and Analytical Conclusions
24. Vietnam War: Key Dates
25. Possible Essay Questions
26. Conclusion
27. Historical Evaluation: Why Did the USA Lose the Vietnam War?
28. How Apollo Scholars Can Help

Frequently Asked Questions

What caused the Vietnam War?
The conflict resulted from Vietnamese nationalism, the division of Vietnam, communist expansion and American attempts to contain communism during the Cold War.

Why did the United States intervene in Vietnam?
American leaders believed that South Vietnam had to be defended against communist expansion. They also feared that a communist victory would encourage neighbouring countries to follow the same path.

What was the Gulf of Tonkin Incident?
It involved alleged attacks by North Vietnamese forces against American destroyers in August 1964. The incident helped Johnson secure congressional authority to escalate the war.

What was the Tet Offensive?
The Tet Offensive was a major series of communist attacks across South Vietnam in 1968. Although US and South Vietnamese forces eventually defeated the attacks militarily, Tet seriously damaged American public confidence.

What was Vietnamisation?
Vietnamisation was Nixon’s policy of gradually withdrawing American troops while increasing the military capabilities of South Vietnamese forces.

Why did the United States withdraw from Vietnam?
Growing domestic opposition, military difficulties, financial costs and the failure to achieve a decisive victory contributed to America’s withdrawal.

When did the Vietnam War end?
The conflict ended in 1975 when North Vietnamese forces captured Saigon and Vietnam was unified under communist rule.

Why was the Vietnam War important?
The war exposed the limits of American military power, weakened public trust in government and influenced US foreign policy for decades.

Cold War Revision Guide: Rise, Rivalry and Collapse 1945 – 1991