The Estella Statute was approved by the Assembly of the municipalities of the Southern Basque Country, with 427 votes in favour. The draft was elaborated by Eusko Ikaskuntza-Sociedad de Estudios Vascos and in the assembly formed the majority Abertzales and Carlists. Among others, like Castilian, Euskera recognized the official status of its scope.

The Second Spanish Republic was an era and, arguing that it was anti-secularism, it was rejected. The most populous municipalities were not here, but in the “Republican preliminary draft” promoted by the deputies.

Five years later, the Statute adopted in 1936 excluded Navarra.