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.
Catalan Countries
Catalan Countries (, ) refers to those territories where the Catalan language, or a variant of it, is spoken. They include the Spanish regions of Catalonia, Valencia, the Balearic Islands and parts of Aragon and Murcia, as well as Roussillon in France, the Principality of Andorra, and the city of Alghero in Sardinia (Italy). In the context of Catalan nationalism, the term is sometimes used in a more restricted way to refer to just Catalonia, Valencia and the Balearic Islands. The Catalan Countries do not correspond to any present or past political or administrative unit, though most of the area belonged to the Crown of Aragon in the Middle Ages. Parts of Valencia (Spanish) and Catalonia (Occitan) are not Catalan-speaking.