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Okay so to start off lets not talk about whether or not the Norse can establish a successful Vinland, there are a million threads out there about that already (though I think they're on the verge of being necro'd).
So assuming the Norse have a stable presence on the Island of Newfoundland or somewhere else around the St. Lawrence Gulf and they're not going to be uprooted by Natives anytime soon what would the implications be in the long term of a Permanent presence of Norse people in North America?
I think I have something of an Idea but I think this could be a good discussion.