Durring the last ice age, the so called "Clovis" people settled North America by way of the Berring land bridge. Evidence showed that they even had considerible success hunting the native megafuana, even nearly causing the American Elephant and Ground Sloth to go extinct. Then they mysteriosly vanish from the fossil record, allowing the megafunal populations to recover, and by the time Europeans first came to the Americas, the continents where completly uninhabited by humans, and still home to a variety of Ice age animals that went extinct elsewhere. So what if the "Clovis" people survived?