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
Nguyễn dynasty the next lord. Lê Chiêu Thống, emperor of the Lê dynasty, wanted to regain power from the Trịnh. He summoned Nguyễn Hữu Chỉnh, governor of Nghệ An, to attack the Trịnh lord at the Imperial Citadel of Thăng Long. Trịnh Bồng surrendered to the Lê and became a monk. Nguyễn Hữu Chỉnh wanted to unify the country under Lê rule, and began to prepare the army to march south and attack the Tây Sơn. Huệ led the army, killed Nguyễn Hữu Chỉnh, and captured the later Lê capital. The Lê royal family were exiled to China, and the later Lê