Ancient River Explorers of North America

The common consensus is that maybe a few lone or stray Vikings visited North America before Columbus sailed over the ocean blue, and we know the rest of it. This does not explain the amazing amounts of Roman, Jewish, early Christian, North African, Celtic, Phoenician and other cultures that left artifacts all over North America. Come with me on amazing river voyages across this vast continent as we actually find out how far early cultures travelled across the lakes, rivers and plains of Nor...