| Term | Definition |
| Ho Chi Minh | Means "He Who Enlightens" and Vietnamese communist statesman |
| Ngo Dinh Diem | South Vietnam's non-Communist leader |
| Domino Theory | The theory that if one country in southeast Asia falls to Communism, the rest will fall very quickly. |
| Vietcong | Communists fighting against the South Vietnamese government |
| Tonkin Gulf Resolution | This gave the president authority to take "all neccessary measure to repel any armed attack against forces of the United States." |
| Ho Chi Minh Trail | A network of jungle paths connecting North and South Vietnam. |
| Students for Democratic Society | A variety of civil rights pacifistic, religious student groups that shaped the anti-war movement. |
| Hawks | Those who support war. |
| Doves | Those who support peace. |
| Credibility Gap | The gap between the Johnson Administration and the American public support. |
| Dien Bien Phu | Where the French were defeated by the North Vietnamese. |
| General Westmoreland | The commander of U.S. forces in Vietnam. |
| Guerilla War | They savotaged people and then ran away. |
| Pentagon Papers | Historical account of the Vietnam War which was highly critical of the war. |
| Tet Offensive | Surprise attacks on cities in South Vietnam on the Asian New Years Day. |
| Agent Orange | A herbicide that is believe to have contaminated Americans and Vietnamese. |