History of Bolivia to 1809 reduction in silver output. After 1700 only small amounts of bullion from Upper Peru were shipped to Spain. Kings from the Bourbon Dynasty in Spain tried to reform the colonial economy in the mid-eighteenth century by reviving mining. The Spanish crown provided the financial support necessary to develop deeper shafts, and in 1736 it agreed to lower the tax rate from 20 to 10 percent of the total output. The crown also helped create a minerals purchasing bank, the Banco de San Carlos in 1751 and subsidized the price of mercury to local mines. The foundation of an academy of
Bourbon claim to the Spanish throne around 824 when they rebelled against nominal Carolingian authority. In 905, a coalition of neighbors forced Fortún Garcés, a grandson of Íñigo Arista, to retire to a monastery, and enthroned in his place a scion of a new dynasty, under which, the name Navarre began to supplant that of Pamplona. With the assassination of Sancho IV, the last king of the aforementioned dynasty, Navarre was invaded by his cousins Alfonso VI of Castile and Sancho Ramirez of Aragon, and the latter made king, leading to a half-century of Aragonese control. The death of Alfonso led to a succession crisis in