Southern Agrarianism encompasses many things – it has aspects of politics, literature, culture, and industry/agriculture. While it is not merely a nostalgia for simpler times, simplicity is a major part of it. The opposite of the simplicity of Southern Agrarianism is the complexity of the civilization that we now have.
In this brief video, Dr. Joseph Tainter explains the collapse of complex civilizations. Dr. Tainter is the author of The Collapse of Complex Societies. Following this brief video is a series of seven videos of a lecture that explain this in a very scholarly manner.
For a more thorough discussion by Dr. Tainter, see the following seven-part series of videos: