La Union was creates by virture of a "Superior Decreto" Issused on March 2,1850 by Governor General Narciso Zaldua Claveria out of nine towns of Pangasinan, three of Ilocos Sur and settlements of the Eastern Pais del Igorotes in the Cordilleras. It's creation as a province was formally approved by a Royal Decree issued by Queen Isabela of Spain on April 18,1850
From it's inception as a province up to the second World war, La Union experience transformation in the socio-culture and politico-economic aspects. After the War, rehabilitation and reconstruction were done eventually propelling the province as the center of commerce and trade and the administrative center of Region I