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.
Spaniards
Within Spain, there are various regional populations including the Andalusians, Castilians, the Catalans, Valencians and Balearics (who speak Catalan, a distinct Romance language in eastern Spain), the Basques (who live in the Basque country and north of Navarre and speak Basque, a non-Indo-European language), and the Galicians (who speak Galician, a descendant of old Galician-Portuguese).