The Greenland colony had a population of hundreds or thousands for several centuries. And Greenland seems to be as much a part of the North American continent as Newfoundland. If you discount Greenland as part of North America why count Newfoundland as a North American settlement at all?
I say that Lief Ericksson was not the first leader of a European settlement in North America. His father Eric the Red was.
And the Greenland settlements in North america were well known in Europe.
I’d say that if a Phoenician shipwreck was discovered in North America, that the Phoenician’s were the first to discover America. Simple as that. But it hasn’t happened, has it? What we do know, is that the Norsemen were here first. There’s no need for Spanish or Portugese commentators to be butthurt over this because it were their discoveries and colonial efforts that got the contemporary world going.
Jamestown was the first permanent and successful colony in North American. Let no one be disillusional about that. The Massachusetts Bay Colony is just a pretender because their original destination was Virginia.
Jamestown is the first "English" permanent settlement in North America, everyone knows that Spanish settlements like St. Augustine in Florida and Spanish colonies in Mexico are older. When people say Jamestown was the oldest, they often sloppily leave off the qualifying statement "English", it usually being understood in the context. Since English settlement would largely influence the future settlement of the US, and Canada, that makes Jamestown importance.