I see many problems here for such scenario to be possible:
1) Zoological: American equivalents of the horse and the ox would be required. The American horse was extinct and the only relative of the ox there, the bison, was not easy to tame. Mind that most of the bisons existing today in America, excepting the Yellowstone ones and some in Canada, are not pure and they are crossed with cattle.
2) Demographic: the American plains were too much sparsely populated in order to create enough pressure for sedentarianism (agriculture etc.) and there were rarely conflicts for hunting areas prior to Columbus.
3) Technical: Neolithic civilizations in the old Mediterranean-Iranian-Indian-Chinese axis copied a lot of technical advances ones from the others, while the Americans remained isolated from other civilizations.
1) Zoological: American equivalents of the horse and the ox would be required. The American horse was extinct and the only relative of the ox there, the bison, was not easy to tame. Mind that most of the bisons existing today in America, excepting the Yellowstone ones and some in Canada, are not pure and they are crossed with cattle.
2) Demographic: the American plains were too much sparsely populated in order to create enough pressure for sedentarianism (agriculture etc.) and there were rarely conflicts for hunting areas prior to Columbus.
3) Technical: Neolithic civilizations in the old Mediterranean-Iranian-Indian-Chinese axis copied a lot of technical advances ones from the others, while the Americans remained isolated from other civilizations.