20 DSST Vietnam War practice questions, with answers and video walkthroughs

Twenty practice questions for DSST A History of the Vietnam War, in the real exam's style. Score 16 of 20 here and you are in passing range. Miss more than four, and the pattern of your misses points straight at the topic to review next. Every question below is explained on video, including why the wrong answers trap most test-takers.

What students preparing for this exam tell us is that steady practice in the exam's format, with an explanation for every miss, is what moves a score. Use these the same way: answer, check, and read why the wrong choices are tempting. For the full plan around them, see the DSST A History of the Vietnam War pillar guide.

Watch the full video walkthrough above, then test yourself on the twenty questions below. Each one is explained on the video, including why the wrong answers trap most test-takers.

Questions 1 to 5 (questions 1 to 5)

1. The Vietnamese independence movement led by Ho Chi Minh against both the French and the Japanese was known as the: Viet Minh. The Viet Minh was the nationalist and communist-led front Ho Chi Minh founded in 1941 to fight for Vietnamese independence. It battled the Japanese in World War Two and then the returning French.

2. The decisive 1954 battle in which Vietnamese forces overran a fortified French garrison and ended French rule in Indochina was: Dien Bien Phu. At Dien Bien Phu the Viet Minh, commanded by General Vo Nguyen Giap, surrounded and crushed the French in 1954. The defeat forced France to negotiate its withdrawal from Indochina.

3. The 1954 Geneva Accords temporarily divided Vietnam into a communist north and a noncommunist south at the: Seventeenth Parallel. The Geneva Accords split Vietnam at the seventeenth parallel, with Ho Chi Minh's government in the north and a noncommunist state in the south. The thirty-eighth parallel is the one that divides Korea, not Vietnam.

4. The American policy fear that if one Southeast Asian nation fell to communism its neighbors would follow was called the: Domino Theory. The domino theory held that if Vietnam fell to communism, neighboring countries would topple one after another like dominoes. It was the central justification American leaders gave for intervening in Vietnam.

5. The nationwide reunification elections promised by the 1954 Geneva Accords were never held mainly because: South Vietnam and the United States Refused, Fearing a Communist Victory. The Geneva Accords called for reunification elections in 1956, but South Vietnam's leader Ngo Dinh Diem, backed by the United States, refused to hold them. They feared the popular Ho Chi Minh would win and unify Vietnam under communism.

Questions 6 to 10 (questions 6 to 10)

6. The 1964 Gulf of Tonkin Resolution is significant because it: Gave the President Broad Authority to Use Military Force Without a Declaration of War. The Gulf of Tonkin Resolution let President Johnson take whatever military action he judged necessary in Vietnam without a formal declaration of war by Congress. It became the legal basis for the massive American buildup that followed.

7. The South Vietnamese president whose unpopular, repressive rule ended when he was overthrown and killed in a 1963 coup was: Ngo Dinh Diem. Ngo Dinh Diem alienated Buddhists and peasants and was assassinated in a November 1963 coup that American officials had tacitly approved. His fall left a string of unstable governments in South Vietnam.

8. The sustained American bombing campaign against North Vietnam that began in 1965 was code-named: Operation Rolling Thunder. Operation Rolling Thunder was the long bombing campaign against North Vietnam launched in 1965 to break its will and cut its supply lines. Despite years of bombing, it failed to stop the flow of men and supplies south.

9. The communist insurgents who fought a guerrilla war inside South Vietnam, often blending into the rural population, were the: Viet Cong. The Viet Cong were the southern communist guerrillas who used ambushes, tunnels, and hit-and-run tactics against American and South Vietnamese forces. Their ability to disappear into the population made them extremely hard to defeat.

10. The network of jungle and mountain supply routes through Laos and Cambodia that funneled men and material from North to South Vietnam was the: Ho Chi Minh Trail. The Ho Chi Minh Trail wound through Laos and Cambodia to move troops and supplies into South Vietnam. Repeated American bombing never managed to shut it down.

Questions 11 to 15 (questions 11 to 15)

11. The coordinated communist surprise attacks launched during the lunar new year of 1968 are known as the: Tet Offensive. The Tet Offensive was a massive wave of attacks across South Vietnam during the 1968 lunar new year holiday. Although it was a military defeat for the communists, it stunned the American public and became a political turning point.

12. The main reason the Tet Offensive is considered a turning point is that it: Shattered American Confidence That the War Was Being Won. Even though American and South Vietnamese forces repelled the attacks, the sheer scale of Tet contradicted official claims that victory was near. It deepened public doubt and pushed President Johnson not to seek reelection.

13. The 1968 event in which American soldiers killed hundreds of unarmed Vietnamese civilians, badly damaging support for the war, was the: My Lai Massacre. At My Lai, American troops murdered several hundred unarmed villagers, including women and children. When the killings became public, the massacre intensified antiwar sentiment at home and abroad.

14. The 1971 leak of a secret Defense Department history that revealed officials had misled the public about the war was called the: Pentagon Papers. The Pentagon Papers were a classified government study, leaked by Daniel Ellsberg, showing that officials had long been more pessimistic in private than in public. Their publication deepened public distrust of the government's handling of the war.

15. President Nixon's strategy of gradually withdrawing American troops while building up South Vietnam's army to fight on its own was called: Vietnamization. Vietnamization aimed to hand the ground war over to South Vietnamese forces so the United States could pull its troops out. Nixon hoped it would let America exit without an obvious defeat.

Questions 16 to 20 (questions 16 to 20)

16. The 1970 American and South Vietnamese ground operation into a neighboring country, aimed at communist bases and supply lines, was the invasion of: Cambodia. In 1970 American and South Vietnamese forces invaded Cambodia to destroy communist sanctuaries and supply lines. News of widening the war into a neutral country set off a wave of campus protests in the United States.

17. The killing of four student protesters by National Guard troops at an Ohio university in May 1970 occurred at: Kent State. At Kent State University, National Guardsmen opened fire on students protesting the invasion of Cambodia, killing four. The shootings shocked the nation and triggered student strikes on hundreds of campuses.

18. The 1973 agreement that ended direct American military involvement and provided for the withdrawal of United States forces was the: Paris Peace Accords. The Paris Peace Accords, signed in 1973, arranged a cease-fire and the withdrawal of American forces and a return of American prisoners of war. Fighting between North and South Vietnam soon resumed despite the agreement.

19. Recognizing limits on the president's power to commit forces, in 1973 Congress passed over Nixon's veto the: War Powers Resolution. The War Powers Resolution required the president to notify Congress within forty-eight hours of sending troops into combat and barred deployments beyond sixty days without congressional approval. Congress passed it over Nixon's veto to rein in presidential war-making after Vietnam.

20. The Vietnam War effectively ended in April 1975 with the: Fall of Saigon to North Vietnamese Forces. In April 1975 North Vietnamese troops captured Saigon, the South's capital, as the last Americans were evacuated by helicopter. The fall of Saigon ended the war and led to Vietnam's reunification under communist rule.

What to do with your score

The point of twenty questions is not the twenty, it is the pattern. Mark which topic each miss came from, then spend your next session on that topic alone. None of it requires starting over, only tightening the spots that cost you points.

A single twenty-question set is a snapshot, not a study plan. To pass with margin you need volume: enough questions, in the exam's format, with explanations that turn a wrong answer into a correction. That is what Flying Prep's DSST A History of the Vietnam War practice is built for: every question explained, with a free trial before you decide.