Answer:
Cultural Structure.
Step-by-step explanation:
The Five Civilized Tribes refers to the five Native American nations—the Cherokee, Choctaw, Chickasaw, Creek (Muscogee), and Seminole. These were the first tribes that were considered to be "civilized" by the European settlers. The tribes each adopted Christianity, literacy, intermarriage (with white Americans), centralized governments, plantation slavery practices, etc.