In 1833, a new Constitution reorganized the country, creating departments, subdelegations and districts as lower entities of provinces.

On 17 September 1925, by Law Decree N.° 529, the department of San Vicente was created, separated from Caupolicán.

[2] In 1928, the government of Carlos Ibáñez del Campo decided to reorganize the provinces of Chile, by Decree with Law Force N.° 8.582 dated 28 January 1929.

[4] In July 1974, a new reform took place, directed by the military dictatorship of Augusto Pinochet, who created regions.

On 1 January 1976, the new VI Región (Sixth Region) came into existence, with the territory of former provinces of O'Higgins and Colchagua.