 Complete the following phrase:  Elements of a Gothic treatment of the South were first apparent during the ante- and post-bellum 19th century in the grotesques of Henry Clay Lewis and in the de-idealized representations of Mark Twain. The genre was consolidated, however, only in the 20th century, when dark romanticism, Southern humor, and the new literary naturalism merged in a new and powerful form of social critique. The thematic material was largely a reflection of the culture existing in the South following the collapse of the Confederacy as a consequence of the Civil War, which left a vacuum in its cultural and religious values. The resulting poverty and lingering bitterness over the issue of slavery in the region during 