In the early 1800s in the South, the social group that had the least divisions within their group was the enslaved African Americans. This group was predominantly unified by their shared status of enslavement and the common experiences of oppression and communal struggle, despite variation in individual experiences.
In contrast, other groups like the planter class, businessmen, and yeoman farmers had various divisions based on wealth, social status, and economic interests. The planter class, for example, could be further divided into rich planters and less wealthy ones, while yeoman farmers could vary widely in terms of land ownership and agricultural practices.
Therefore, the enslaved African Americans, while facing severe hardships, represented a more cohesive social group in the context of their shared experience.