'I forget how the main characters referred to the war.'
@Sancho,
Initially it was referred to as "the Cause" ~ that is, a 'righteous struggle' against Yankee 'aggression' which sought to undermine their way of life. Then it is referred to the "Lost Cause". At first it was thought to be a glorious, noble, and worthy effort. Then when they paid a heavy price tag they conceded that it was not worth it at all. At no point did they concede that slavery was an evil or that secession was illegal. Instead they employed every manner of self justification and apologia to defend both, never conceding at all that they started and prolonged the war.