The Lost Colony at Roanoke didn't happen-he says

From the link:

The most common theory has long been that the settlers integrated with the Croatoans. The main reason why is the fact "CROATOAN" was left behind as a message by the settlers when they disappeared.

It would make sense that people leaving would try to leave some kind of message behind to indicate where they were headed.

Yet, there's never been concrete proof that's what actually happened. Mark Horton and Scott Dawson finding evidence of metal working in the region where the Croatoans lived seems like rock-solid evidence Europeans with those skills linked up with them.