Why did many Southeastern Indigenous towns include earthen mounds?

In the American Southeast, the construction of earthen mounds was a defining feature of the Mississippian culture, which flourished from approximately 700 ce.1

These structures were primarily platform mounds, characterized by their flat tops, which served as elevated foundations for the community’s most significant buildings, including temples and council houses. These mounds were typically arranged around a large central plaza, which functioned as the social and ceremonial heart of the town.1

While earlier traditions in North America, such as the Adena and Hopewell cultures, frequently built mounds for burial purposes, Mississippian platform mounds were distinct in their role as architectural supports for civic and religious life. By elevating important structures, these mounds reflected the culture's focus on religious practices, such as the veneration of the sun and ancestral figures, and provided a centralized space for the organized priesthood to conduct rituals and manage community resources.21