Hi, I am seeking the community’s knowledge regarding precolumbian communities on the modern east coast of the usa, or similarly in coastal brazil and la plata areas of south america.

To be honest, I am not convinced by modern narratives that only relatively less complex (compared to Aztec, Mayan, Incan communities) precolumbian indigenous communities existed where european settlers have established their largest populations in the western hemisphere.

That is, to me, it looks like the evidence of some of the most complex precolumbian societies has been systematically destroyed by settlers to hide the depth of their crimes. The most succinct way to phrase this is that I find it odd that the area of the modern east coast of the usa (as well as brazil, argentina) did not have a historical society at least as complex as the nearby, contemporaneous Mississippian cultures when the land and climate of the east coast region are so favorable to large, complex societies.

Does anybody have resources regarding this? I am interested in any evidence that will help me read between the lines of the contemporary narrative, or I otherwise would appreciate evidence arguing the main idea outlined here is invalid.