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I can almost guarantee this has been discussed before, but searching for it I find it difficult to find anything.
Would there have been a possibility of an increase in the Norse colonisation of the 'New World' such that a hybrid population of Norse & North Americans hold sufficient power that later European colonisation is stopped or at least hampered.
I think there are a lot of reasons why this couldn't happen (not a large enough population to start with) but are there any butterflies that can really increase the power of the Norse-Native Americans?