 Complete the following phrase:  One of the consequences of the First Carlist War was the substitution of the Ancien Régime Basque home rule fueros by a limited still relevant autonomy. A majority in Navarre and the rest of the Basque districts supported the pretender to the Spanish crown Carlos V for his support to their institutions and laws characterized for being more liberal than elsewhere in Spain. However, they were defeated in 1839, and Navarre, Biscay, Álava and Gipuzkoa were integrated into the Spanish customs system. Basque industrialists profited from privatization of exploitations and the Spanish captive market with the iron ore and the Bessemer converter, and Biscay became the iron 