What is the importance of Vinland in The Vinland Sagas: The Norse Discovery of America?

Vinland is an area that is today the Northern tip of Newfoundland, Leif Eiriksson built the first Norse settlement there in the early 11th century, nearly five hundred years before Columbus. The land is named Vinland because of its wild grapes and plentiful resources. Other expeditions were led to Vinland, but the last mentioned is that of Karlsefni. His settlement may have been successful save that he and others judged the land upset due to the large presence of Skrælings.