Frederick Jackson Turner,
The Frontier in American History
“ From the beginning the Ohio Valley seems to have been a highway for migration, and the home of a culture of its own. The sciences of American archeology and ethnology are too new to enable us to speak with confidence upon the origins and earlier distribution of the aborigines, but it is at least clear that the Ohio river played an important part in the movements of the earlier men in America, and that the mounds of the valley indicate a special type of development intermediate between that of the northern hunter folk, and the pueblo building races of the south. ”
