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In page Slavery in Latin America:

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Pressure for the end of slavery and forced labor among the indigenous Indians worked to increase the demand for African slaves to do the work instead. Rodrigo de Albornoz, a layman, was a former secretary to Charles V sent as an official to New Spain, who opposed the treatment of the indigenous, though himself importing 150 African slaves. Las Casas also supported the importation of African slaves as preferable to Amerindian forced labor, although he later changed his mind about this[citation needed].