Which Southeastern Indigenous society had social groups resembling a caste system?

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While the Natchez are frequently cited in historical accounts for their elaborate, hierarchical social structure, the Chitimacha are considered the only society in the American Southeast to have possessed a true caste system in the strict sense of the term, characterized by ranked groups that practiced strict endogamy (marriage within the group).1

The Natchez social hierarchy, which was highly stratified and influenced by religious beliefs, classified individuals into four groups: suns, nobles, honoured people, and commoners. Although this system involved strict rules regarding social status and marriage, it differed from a strict caste system because members of the upper classes were required to marry commoners, a practice that would have made the system unstable over time. Scholars suggest that the inconsistencies in the reported Natchez social structure likely stem from the inaccuracies or incompleteness of early French colonial records.231