Spain is a multilingual state. Spanish—featured in the 1978 Spanish Constitution as ''castellano'' ('Castilian')—has effectively been the official language of the entire country since 1931. As allowed in the third article of the Constitution, the other 'Spanish languages' can also become official in their respective autonomous communities. The territoriality created by the form of co-officiality codified in the 1978 Constitution creates an asymmetry, in which Spanish speakers' rights apply to the entire territory whereas vis-à-vis the rest of co-official languages, their speakers' rights only apply in ''their'' territories.