University of Groningen
American History: Essays: Colonization in Texas: Cultivation of Cotton and Wheat
Discusses the cotton economy in the Lower and Upper South of Texas in the 1800s, and the role transportation played in its growth, or lack thereof in some regions. Wheat was more widely grown in the Upper South where the yeomen farmed.
Google
The Life of Yeoman Farmers
A look at the lives of the yeoman farmers who lived in the South. The yeomen were akin to the status of a middle class of farmers.
Khan Academy
Khan Academy: Us History: 1844 1877: The Slave Economy
The South relied on slavery heavily for economic prosperity and used wealth as a way to justify enslavement practices.