521 languages have been spoken in Nigeria; nine of them are extinct. In some areas of Nigeria, ethnic groups speak more than one language. The official language of Nigeria, English, was chosen to facilitate the cultural and linguistic unity of the country, owing to the influence of British colonisation which ended in 1960. Many French speakers from surrounding countries have influenced the English spoken in the border regions of Nigeria and some Nigerian citizens have become fluent enough in French to work in the surrounding countries. The French spoken in Nigeria may be mixed with some native languages. French may also be mixed with English.