Guaraní are a group of culturally related indigenous peoples of South America. They are distinguished from the related Tupi by their use of the Guaraní language. The traditional range of the Guaraní people is in what is now Paraguay between the Uruguay River and lower Paraguay River, the Corrientes and Entre Ríos Provinces of Argentina, southern Brazil, and parts of Uruguay and Bolivia. Although their demographic dominance of the region has been reduced by European colonisation and the commensurate rise of mestizos, there are contemporary Guaraní populations in these areas. Most notably, the Guarani language, still widely spoken across traditional Guaraní homelands, is one of the two official languages in Paraguay, the other one being Spanish. The language was once looked down upon by the upper and middle classes, but it is now often regarded with pride and serves as a symbol of national distinctiveness. The Paraguayan population learns Guaraní both informally from social interaction and formally in public schools. In modern Spanish Guaraní is also applied to refer to any Paraguayan national in the same way that Mexicans are labelled Aztecs and French are called Gauls.