Read this: Before A.D. 200, residents were building earthwork mounds, which were used for ceremonial and religious purposes. Succeeding peoples, including those of the ancient Mississippian culture established by A.D. 1000 in the Piedmont, continued to build or add onto such mounds. In the 500–700 years preceding European contact, the Mississippian culture built large, complex cities and maintained far-flung regional trading networks. Historically documented tribes in the North Carolina region included the Carolina Algonquian-speaking tribes of the coastal areas, such as the Chowanoke, Roanoke, Pamlico, Machapunga, Coree, Cape Fear Indians, and others, who were the first to encounter the English; Iroquoian-speaking Meherrin, Cherokee and Tuscarora of the interior; and Southeastern Siouan tribes, such as the Cheraw, Waxhaw, Saponi, Waccamaw, and Catawba.[citation needed]

By 1000 AD, what culture of people settled in the Piedmont?
What is the answer? (If it cannot be answered, return "unanswerable")
ancient Mississippian culture