How did the Civil War have a social impact on the South?

Good question! Short answer: In countless ways.

Slightly longer answer: While the war itself had numerous effects (rationing of supplies, shortages of industrial products manufactured primarily in the North etc.), the biggest effect was without a doubt the eventual abolition of slavery in the confederate states. This had a profound impact on the social fabric on the whole of the US with ramifications felt until today. On a purely economic side of things, the entire labour system needed to adapt to labourers that now required a wage. Additionally, with the formerly enslaved being a new voting demographic, the nature of politics changed completely. At the same time, racist organisations like the KKK attempted to prevent the newly freed from voting though threats and terror.