The history of Sweden started to diverge from OTL in 1240, when the Swedes did NOT attack Novgorod, due to the lack of a Mongol attack on Russia. 1288, the island of Gotland became Swedish. From 1319-65, Magnus VII Eriksson was also king of Norway. In 1352, he conquered Skåne (South Sweden) from Denmark; but 1361-64, the Hanseatic League defeated Sweden-Norway in a trade war, which influenced Norway to declare independence again.