Poor white folks claiming "the South will rise again" are talking about how they wish to be serfs to a feudal lord, more or less.

"The South" was never wealthy. The big landowners were, though.

"The South rising again" would only be more of the same poverty & exploitation for most of its residents. These fools don't realize that when there is a landed, propertied class, everyone else lives at their whims. It should be obvious, but I guess it's not.