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 Catalan
Catalan originated from Vulgar Latin in the Pyrenees Mountains between France and Spain. It diverged from the other Romance languages in the 9th century. At that time, Catalan spread quickly throughout the Iberian peninsula when the Catalan counts conquered Muslim territory. By the 11th century, the Catalan language was present in several feudal documents. Catalan was present throughout the Mediterranean by the 15th century. This was during a time when the city of Valencia was thriving.
In 1659, the Treaty of Pyrenees was signed, beginning a suppression of the Catalan language. Louis XIV issued a decree that prohibited the use of the Catalan language in Northern Catalonia. The repression continued during the French Revolution when the First French Republic prohibited the usage of Catalan in linguistic education. The repression continued until recently, when finally the French government in 2007 promoted the usage of Catalan publicly and in education.