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.
History of Catalonia
The Iberian language was a Paleohispanic language. The oldest inscriptions are dated from the end of the 5th century BC, and the most recent of the end of the first century BC, even at the beginning of the 1st century AD, after being gradually replaced by Latin. In its different variants, the Iberian language was spoken in a broad coastal strip stretching from southern Languedoc to Alicante.