The earliest people in the Americas probably were Asians who crossed the prehistoric land bridge across the Bering Strait. They were largely of Mongoloid ancestry.
At least 10,000 years ago, prehistoric people came to what is now Illinois. Archeological excavations at the Koster Site in the lower Illinois River valley have revealed evidence of almost continuous habitation there by advanced Indian cultures from about 8000 B.C.
Maryland was inhabited by Indians centuries before European settlement. The major tribes were the Piscataway in the west and the Nanticoke in the east, both of the Algonquian language family.