Holding Norway would reshape Germany's resource war

How would the war change if the Allies held northern Norway and then the whole country?

Germany would lose easier access to Swedish ore and face far tighter Allied control of the North Sea and Arctic routes.

An Allied-held Norway would have both industrial and geographic effects. Swedish iron ore would be harder for Germany to obtain during the months when northern routes mattered most. Allied airfields on both sides of the North Sea would support continuous surveillance, refuelling, and interdiction. Air power and a possible mine barrier could bottle German naval forces more tightly into their bases. The changed northern position would also transform protection of the Arctic convoys, making Norway consequential far beyond the land campaign itself.