The primary reason the Spanish brought enslaved people from West Africa to New Spain was that they used them as workers on their plantations. The harsh conditions and high mortality rates among Indigenous peoples due to European diseases, forced labor, and violence led to a significant labor shortage in the colonies. To meet the demand for labor, particularly in agriculture and resource extraction, the Spanish turned to the transatlantic slave trade and imported enslaved Africans.
While there were other motivations for bringing people to the New World, such as cultural assimilation or ranching practices, the chief objective was to employ enslaved Africans as a labor force in agriculture and plantations.