The fossil history of the bovids begins in the early Miocene. _The bovids that currently inhabit North America probably reached the continent by dispersal from northern Asia_ during the Pleistocene, when they crossed the Bering Strait on a land bridge. The climate was most likely chilly, which may be why North American bovids are cold-adapted."
so...where did the Bovids arise?
different prehistoric species. And every animal that is labeled as a "prongbuck" in the galleries (family Antilocapridae) lives in North America. All other similar forms are bovids. While doing searches for other sites that explain the differences between African Antelope and Pronghorns I came across quite a few that explained that Antelope have never been found in America.