Basically, what if the Republic of Austria, after 1918, had managed to negotiate its way to retaining the majority German province of South Tyrol (minus the Trentino region, which imbues some confusion into me as it could theoretically be considered “Middle Tyrol”), thus preventing 150.000 German-identifying persons from becoming Italian for the rest of foreseeable history?
What effects would this entail on interwar Austria and Italy?