This may be too complicated a topic and title, but taking the set of European countries where most people speak the same language, and which have their own government and sovereignty, which are the most likely to wind up as part of some other country or have a different language in a different timeline?
Note that Belgium and Switzerland and both excluded, as being federations of peoples with different languages. Making sure that Germany and Italy never unite doesn't meet the criteria either (and anyway people tend to exaggerate the weakness of pre-1870 national German institutions). I think the leading candidates to have at the most a regional, not a national, identity are Portugal and Ireland, with Norway some ways behind them.
Note that Belgium and Switzerland and both excluded, as being federations of peoples with different languages. Making sure that Germany and Italy never unite doesn't meet the criteria either (and anyway people tend to exaggerate the weakness of pre-1870 national German institutions). I think the leading candidates to have at the most a regional, not a national, identity are Portugal and Ireland, with Norway some ways behind them.