From the Viking age onwards, the Nordics have fought each other, formed unions with each other and ruled over each other. Unavoidably, this has caused some anti-pathies, but it has also made the Nordic cultures more uniform. Sm rg sbord with pickled herrings and open-faced sandwiches is no rare sight. Women are emancipated.
Towns are clean and well-functioning enough to make a Swiss clocksmith feel at home.
Some of them are, of course, less true than others, but their very existence illustrates the fact that we do have quite a lot in common. Trolls and gnomes still inhabit Nordic households, although the once revered and feared mythical beings have been reduced to the lowly caste of soft toys. The Finns and the S mi ought to have a common set of folklore and old relicts of religious traditions, but it is rather hard to find a common denominator for Fenno-Ugric traditions. For instance are the S mi the only Fenno-Ugrians where shamans are known. Probably the Finns and the northern Germanians have made impressions in both directions.