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.
Catalonia
Catalonia (; ; ; ;) is an autonomous community in Spain on the northeastern corner of the Iberian Peninsula, designated as a "nationality" by its Statute of Autonomy. Catalonia consists of four provinces: Barcelona, Girona, Lleida, and Tarragona. The capital and largest city is Barcelona, the second-most populated municipality in Spain and the core of the sixth most populous urban area in the European Union. It comprises most of the territory of the former Principality of Catalonia (with the remainder Roussillon now part of France's Pyrénées-Orientales, Occitanie). It is bordered by France (Occitanie) and Andorra (Andorra la Vella, Encamp, Escaldes-Engordany, La Massana and Sant Julià de Lòria) to the north, the Mediterranean Sea to the east, and the Spanish autonomous communities of Aragon to the west and Valencia to the south. The official languages are Catalan, Spanish, and the Aranese dialect of Occitan.