Languages of Catalonia
The main cause of Spanish and Catalan social bilingualism in modern Catalonia was large-scale migration from the rest of Spain during the 20th century, as Catalonia started a significant industrialization which demanded an increased workforce from elsewhere. Spanish has historically been spoken among a minority of civil servants born in other regions in Spain and among segments of the wealthiest bourgeoisie. Spanish has also been spoken as a second language by most Catalans, as it has been the only official language over long periods since the eighteenth century.
Gascon language
Aranese, a southern Gascon variety, is spoken in Catalonia and has been greatly influenced recently by Catalan and Spanish. Both these influences tend to differentiate it more and more from the dialects of Gascon spoken in France. Since the 2006 adoption of the new statute of Catalonia, Aranese is co-official with Catalan and Spanish in Catalonia (before, this status was valid for the Aran Valley only).