Sardinia's relative isolation from mainland Europe encouraged the development of a Romance language that preserves traces of its indigenous, pre-Roman language(s). The language is posited to have substratal influences from Paleo-Sardinian, which some scholars have linked to Basque and Etruscan; comparisons have also been drawn with the Berber languages from North Africa to shed more light on the language(s) spoken in Sardinia prior to its Romanization. Subsequent adstratal influences include Catalan, Spanish, and Italian. The situation of the Sardinian language with regard to the politically dominant ones did not change until fascism and, most evidently, the 1950s.