Propaganda: It assumed that if South Vietnam fell to communism, Southeast Asia then New Zealand, Australia and even Japan would follow soon enough becoming a threat to the national security
Protests: "What was this war for? Was it really justified? Are we really fighting communism?" Those questions led to strong protests. Soon there were hundreds of thousands of advocates for the anti-war movement across the nation.
Media: one of the most publicized wars in all of American history. They watched their television and it showed film and photographs of soldiers fighting the Vietcong.