A language is a culture ...

So, can two languages slash cultures cohabitate in the same state?
If even the seemingly neat split in Belgium between French-speakers and Flemish/dutch-speakers does not work ... what about in Spain and Catalonia? or Spain and Vasque Country? Feel free to bet as to how much longer will it hold up together.

Article in the New York Times: "With Flemish Nationalism on the Rise, Belgium Teeters on the Edge"