This area was occupied by various cultures of indigenous peoples for thousands of years before European contact. Evidence has been found of indigenous occupancy since the Archaic Period (8000 to 2000 BCE). More development took place in the Early Woodland period, such as the Adena culture (1000 to 200 BCE). Middle and Late Woodland occupancy continued to about 1000CE, before the rise of the Mississippian culture along the Mississippi River and its major tributaries. It influenced a continent-wide trading and cultural network.