Gulf of Tonkin incident:

The United States government falsely claimed that a second incident occurred on August 4, 1964, between North Vietnamese and United States ships in the waters of the Gulf of Tonkin. Originally, US military claims blamed North Vietnam for the confrontation and the ostensible, but in fact imaginary, incident on August 4. Later investigation revealed that the second attack never happened. The official American claim is that it was based mostly on erroneously interpreted communications intercepts.[5][6] The National Security Agency, an agency of the US Defense Department, had deliberately skewed intelligence to create the impression that an attack had been carried out.[7][8][9]“

They used the Vietnam war to spread communism not contain it.

Cambodia got independence from France in ‘53 and had a solid, home-grown kingdom for nearly 20 years until the US backed a coup. Then US bombing helped the Paris-educated Khmer Rouge take control. With US backing they murdered millions… anyone who was educated / etc. We’re told Vietnam fell to the communists when the US left, but when we left… Vietnam invaded Cambodia overthrew the communists and put a stop to their genocide.

Anything the Gobermint told the people

https://www.britannica.com/event/Vietnam-War/French-rule-ended-Vietnam-divided

I am looking forward to reading an answer to this question, too. I just remember wearing the POW bracelets as a little girl.