I read somewhere that the last hostilities on Swedish soil were ~1812 when the Russians came down near Skellefteå. Was this part of Sweden ever a part of Russia or Finland and does their dialect reflect this fact?
Skellefteå has always been swedish, or maybe the sami people was there before but if so that was really long ago. But they have a very strange dialect up there anyway, called "bondska", best translated to "farmer". A dialect with many old traits, lost by the faster evolving language further south. But of course these days dialects are fading away when people has TV, radio and moves around cross country all the time.