NORSE / SCANDINAVIAN HISTORY

From the Viking age onwards, the Nordics have fought each other, formed unions with each other and ruled over each other. Sweden ruled over Finland for over 600 years, Denmark ruled over southern Sweden also for over 600 years (or, alternatively, Sweden has ruled over eastern Denmark for the past 300 years) and over Norway for nearly 500 years, while Iceland was ruled from Norway for some 200 years and then from Denmark yet another 500 years, and the list goes on (but Finland hasn't ruled over anybody. Unavoidably, this has caused some antagonism, but it has also made the Nordic cultures more uniform.