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
Islam during the Song dynasty Islam during the Song dynasty The transition from the Tang to the Song dynasty (960–1279) in China did not greatly interrupt the trends of Muslims established during the Tang. Many Muslims began to go to China to trade during the Tang dynasty. During the Song dynasty, Muslims began to have a greater economic impact and influence on the country. During the Song dynasty (960–1279), Muslims in China dominated foreign trade and the import/export industry to the south and west. Indeed, the office of Director General of Shipping for China's great seaport of Quanzhou was consistently held by a Muslim during