What was the name of the union Sweden seceded from under Gustav I's rule?
Kalmar Union
Nordic Union
Scandinavian Alliance
Baltic Federation
Answer
Under Gustav I's rule, Sweden seceded from the Kalmar Union, a political union of Denmark, Norway, and Sweden that lasted from 1397 to 1523. Gustav I's election as king marked the final secession of Sweden from the union.
Unraveling the Reign of Gustav I: The Enigmatic King of Sweden (1523-1560)