Just like Spanish was actually the language of Castilla region, and all other Iberian languages had to struggle for survival.
During multiple times throughout the history, it wasn't healthy to speak other Iberian languages in public.
During multiple times throughout the history, it wasn't healthy to speak other Iberian languages in public.
- Florentine Italian displaced Sardinian, Napolitan, Romanesco, etc.
- Ille-de-france French displaced Provencal, Occitan, Breton, etc.
- English displaced Scots, Gaelic, Welsh, etc.
Even countrires traditionally considered "nation-states" in a linguistic sense such as Portugal went down this route to some degree, with Mirandese and Barranqueno all but gone nowadays.
Didn't knew that main Italian came from Florence, thanks for the hint.
I know my Iberian friends might have an argument about the last three ones, but I opted to list them as such anyway.
Then there are tiny ones like Leonese, which the government provides support for learning and still have small communities speaking it.