Here’s a map of distribution of fluted points (loosely “arrowheads,�? but they were really spear points or knives) by county across the US (mostly), current as of 1998, with the density reflected in the darkness of the blobs. The fluted points were made by the peoples who successfully colonized the New World, although there may have been earlier arrivals who did not leave genetic or linguistic evidence of their presence. These data suggest the fluted-point people did not arrive along an ice-free corridor through the Rockies, but instead worked their way considerably southward along the Pacific coast, then crossed eastward from what’s now southern California. Although there’s discussion of earlier and later arrivals from Europe/Greenland, this bunch came from Asia. These fluted points date to the 1500 years prior to 11,200 years ago.
John and I heard the latest on this from Dave Anderson, at a lecture at Fernbank (site loads slowly) recently.
Map from: Anderson, David G., and Michael K. Faught. 1998. The Distribution of Fluted Paleoindian Projectile Points: Update 1998. Archaeology of Eastern North America 26:163–87.