The Kalmar Union (1397-1523) had a big impact on Swedish society in many ways. Here’s a simpler look at what happened:

1. Political Structure:

   • Sweden was joined with Denmark and Norway under one king. This meant that power was more focused in one place.
   • Many Swedes didn’t like being controlled by someone from another country, which led to fights and disagreements.

2. Social Hierarchy:

   • The Union made nobles (rich landowners) stronger while peasants (common people) became weaker.
   • Only about 10% of the people were nobles, while around 90% were peasants.

3. Cultural Exchange:

   • There was more trade between Scandinavian countries, which mixed up cultures.
   • New goods, ideas, art, and literature were shared among the countries.

4. Economic Implications:

   • The Union helped boost trade by about 30% during its best years, making the sea important for the economy.
   • Controlling the busy Baltic trade routes improved the economy even more.

Overall, the Kalmar Union changed how Swedish society worked and influenced many aspects of life.