Historians used to discuss how the Norwegians were treated while Norway was part of Denmark. Were they treated like fellow and equal Danes, or did the Danish nobles suppress the Norwegians people?
Today it’s agreed that it was a mix of both. The Norwegians were treated as fellow and equal Danes, unfortunately the Danes were already being suppressed by the Danish nobles.
Non the less it was obvious who was Denmark’s favourite, and when Denmark lost Norway to Sweden, Denmark’s treatment of Iceland, Greenland and the Faroe Islands suddenly worsened tenfold.
So Denmark did not take the loss of Norway well. Instead of just moving on, he took it out on all the not-Norways left in his house.