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.
Valencian Community
Spanish (Castilian or "castellano") has official status in all of Spain, including the Valencian Community. Aside from it, the Statute of Autonomy recognizes Valencian as the language proper to the Valencian people ("llengua pròpia"), and commends its protection and regulation to the Acadèmia Valenciana de la Llengua (AVL) under the Generalitat Valenciana. Valencian is also official in the autonomous communities of Catalonia and the Balearic Islands, where it is called Catalan.