Answer:
Vietnam was the first "TV War" (people home knew what was going on and how bad it was) and so it led to widespread public protest and anti-war sentiment, particularly over the Draft. Various prominent groups like the counterculture movement and the Civil Rights movement opposed it.
It cost a lot of money, resources, and people, and many Americans thought it wasn't worth it.
Explanation: Apologies if this was a "one of of x options" question, but I hope those facts help