The majority of ''porteños'' have European origins, mostly from the Italian regions of Calabria, Liguria, Piedmont, Lombardy, Sicily and Campania and from the Andalusian, Galician, Asturian, and Basque regions of Spain. Unrestricted waves of European immigrants to Argentina starting in the mid-19th century significantly increased the country's population, even causing the number of porteños to triple between 1887 and 1915 from 500,000 to 1.5 million.