How did American learn what was going on in Vietnam war?

Answer: They probably learned it from the news on TV and radio, there is also the news paper and announcements from government officials

The Vietnam war was the first war to be recorded and played on national television and was nicknamed living room war because people would watch it in their living room war. Plus at the time the US president would broadcast on the radio lieing to the public about how many people died in the war and giving false updates about how the US was winning the war and close to victory.