1490-1573 16thcentury administration america bartolomeìdelas bartolomédelas bartolomédelas biography casas colonies colonization confession congresses correspondence discoveriesingeography discoveryandexploration dominicans drama dramacasas earlyworksto1800 explorers historiasociedades history indians juanginésde latinamerica missionaries sepúlveda slavery slavetrade socialconditions sources spain spanish spanishcolonies treatmentof