Which characteristic of the vietnam war was central to changing public opinion about the war?

Explanation:

Well if was a few things, first was the idea of why are we fighting to protect the democracy of a country have way across the world especially when many South Vietnamese government seemed on the edge of collapse and was oppressing the Buddhist majority, then fact that we had a draft here, however politicians refused to activate the reserve and the national guard so many young people who were forced to serve were upset, then many people believed the Vietnamese people had the right to self determination.

but the many TL DR reason was just how many Americans were being killed in the pointless war and how many Americans were captured, also in 1967 and 1968 when it seemed like we couldn't win the war, and when documents were released saying that LBJ didn't think we could win either that really hurt support for the war  

TL DR reason was just how many Americans were being killed in the pointless war and how many Americans were captured, also in 1967 and 1968 when it seemed like we couldn't win the war, and when documents were released saying that LBJ didn't think we could win either that really hurt support  

a drastic rise in oil prices ended decades of postwar.