It’s an example of to define the establishment and division of power between the Federal government and state governments. It also was used to define federal taxing power, federal police power, and federal regulations.
Mississippian culture was not a single "tribe," but many societies sharing a similar way of life or tradition. Mississippian peoples lived in fortified towns or small homesteads, grew corn, built large earthen mounds, maintained trade networks, had powerful leaders, and shared similar symbols and rituals.
They have them so that students have a chance at receiving a better education than they would have in Brazil.