Comment by jacquesm

Belgium actually obeys their constitution, they're capable of reigning in excesses. Yes, the four (not two) language areas (Vlaanderen, Wallonia, the German area and the twin language area of Bruxelles) of the country are a massive complication, but I actually really like how they manage to get along in spite of it.

There are many other countries in Europe (and outside of it) that are multi-lingual and for the most part having a single language is not a core requirement for being a nation state.