 Around 900 CE, a Mississippian culture took root in western and central Kentucky; by contrast, a Fort Ancient culture appeared in eastern Kentucky.While the two had many similarities, the distinctive ceremonial earthwork mounds constructed in the former's centers were not part of the culture of the latter.In about the 10th century, the Kentucky native people's variety of corn became highly productive, supplanting the Eastern Agricultural Complex, and replaced it with a maize-based agriculture in the Mississippian era.