 During that season, 1940–41, the Serbian League included the clubs from the Subassociations of Belgrade, Novi Sad, Subotica, Zrenjanin, Kragujevac, Niš, Skoplje, Sarajevo, Banja Luka and Cetinje, which territorially comprised all of current-day Serbia, North Macedonia, Montenegro, Bosnia and Herzegovina and a minor portion of the Eastern part of Slavonia, along the Danube River, nowadays in Croatia.However, due to the start of the Second World War, this final stage at national level was never played.After the Axis invasion of Yugoslavia in April 1941, the country entered into war and was set apart, with several portions of its territory being annexed by Axis-allied neighbours and the Nazi puppet state of Independent State of Croatia was created.