Propaganda was used during the Vietnam War as the United States government lied about the true situation in Vietnam.
This refers to the use of lies to convince people or sway public opinion about a certain event.
However, when the people found out these lies, they were angry and became disillusioned with the government for lying to them as they saw images of dead American soldiers as it was clear that they were NOT winning the war.
Please note that your question is incomplete so I gave you a general overview to help you get a better understanding of the concept.
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https://brainly.com/question/25836020