In 1922, Sweden held a referendum on prohibition. In the end, the proposal to make alcohol illegal lost with 51% of the electorate voting against it.
Now, what if the pro-prohibition side campaigned somewhat more successfully and won? I'll just handwave why it would be so, but with such a small victory to the "NO" side in the OTL vote, I can't see the pro-side winning as impossible. Maybe our Swedish friends can weigh in, how likely is this?
Assuming this does happen... What would be the immediate and intermediate knock-on effects of Sweden going dry, say from January 1st 1923? One thing that comes to mind is Norway IOTL legalizing the sales of beer and wine at that same time. Would Norway do that if Sweden is going the other way, or would they hold on to more strict prohibition due to the Swedish decision as well?
ITTL, we could then conceivably have all of the Nordics save Denmark have prohibition between, say, 1923 and the early thirties. The Great Dry North, if you will. What would the wider implications of this be?