The indigenous population dramatically collapsed overwhelmingly due to epidemic diseases introduced by the Spanish as well as exploitation and socioeconomic change. Viceroy Francisco de Toledo reorganized the country in the 1570s with gold and silver mining as its main economic activity and Amerindian forced labor as its primary workforce. With the discovery of the great silver and gold lodes at Potosí (present-day Bolivia) and Huancavelica, the viceroyalty flourished as an important provider of mineral resources. Peruvian bullion provided revenue for the Spanish Crown and fueled a complex trade network that extended as far as Europe and the Philippines. Don Sebastian Hurtado de Corcuera, governor of Panama was also responsible for settling Zamboanga City in the Philippines, which now speak a Spanish Creole by employing Peruvian soldiers and colonists. Because of lack of available work force, African slaves were added to the labor population. The expansion of a colonial administrative apparatus and bureaucracy paralleled the economic reorganization. With the conquest started the spread of Christianity in South America; most people were forcefully converted to Catholicism, taking only a generation to convert the population. They built churches in every city and replaced some of the Inca temples with churches, such as the Coricancha in the city of Cusco. The church employed the Inquisition, making use of torture to ensure that newly converted Catholics did not stray to other religions or beliefs. Peruvian Catholicism follows the syncretism found in many Latin American countries, in which religious native rituals have been integrated with Christian celebrations. In this endeavor, the church came to play an important role in the acculturation of the natives, drawing them into the cultural orbit of the Spanish settlers.