The Cold War domino theory and the escalation of US involvement in Vietnam.
Historical background
The domino theory held that if one country fell to communism, its neighbours might follow. US leaders invoked it to explain why developments in Indochina mattered beyond Vietnam’s borders.
The song connects that idea with the long arc of the Vietnam War. The Gulf of Tonkin incident helped pave the way for escalation, while the Tet Offensive and the eventual fall of Saigon marked very different stages in the conflict.
