East-west continent span seems irrelevant, at least for modern civilization, as it was on its way all the way from Upper Paleolithic up to something reasonably civilized in Central America too, independently, up to the point when we broke their isolation.
East-west continent span seems irrelevant, at least for modern civilization, as it was on its way all the way from Upper Paleolithic up to something reasonably civilized in Central America too, independently, up to the point when we broke their isolation.