USA HISTORY

Detailed explanation-1: -The most famous of these is Cahokia, a centre of the Mississippian Culture that was first constructed around AD 1050 in Western Illinois. Cahokia covered an area between six to nine square miles and contained 120 earthen mounds.

Detailed explanation-2: -From c. 500 B.C. to c. 1650 A.D., the Adena, Hopewell, and Fort Ancient Native American cultures built mounds and enclosures in the Ohio River Valley for burial, religious, and, occasionally, defensive purposes. They often built their mounds on high cliffs or bluffs for dramatic effect, or in fertile river valleys.

Detailed explanation-3: -From about 800 CE, the mound building cultures were dominated by the Mississippian culture, a large archaeological horizon, whose youngest descendants, the Plaquemine culture and the Fort Ancient culture, were still active at the time of European contact in the 16th century.

Detailed explanation-4: -Constructed around the year 250 by the ancestors of the Mississippian people called the Hopewell, the Great Circle and Octagon Earthworks most likely served as elaborate ceremonial structures where people gathered for large, seasonal rituals and ancestral rites.

Detailed explanation-5: -The first Indian group to build mounds in what is now the United States are often called the Adenans. They began constructing earthen burial sites and fortifications around 600 B.C. Some mounds from that era are in the shape of birds or serpents, andprobably served religious purposes not yet fully understood.