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.
Occitans
The Occitan language is still used to varying levels by between 100,000 and 800,000 speakers in southern France and northern Italy. Since 2006, the Occitan language is recognized as one of the official languages in Catalonia, an autonomous region of Spain.