Summary

Historiography has traditionally divided the policy of introducing enslaved people to Spanish America into three periods based on the legal framework in effect at the time. These divisions are: the period of licensing from 1493 to 1595; the period of asientos from 1595 to 1789: and the period of free trade in enslaved people from 1789 to 1812. However, Spanish enslaved traffic did not end in 1812; it remained for decades thereafter, with the main destinations being Cuba and Puerto Rico. Spanish colonial expeditions to the Americas included enslaved Black people from the outset. The Instructions to Comendador Fray Nicolás de Ovando, published in 1501, contain the earliest reference to Black slavery in the West Indies. Supply was seen as an increasingly important problem as demand grew. Systematic mechanisms were needed to ensure a regular supply of enslaved people.

The joining of the Portuguese and Spanish crowns under Phillip II, known as the Iberian Union (1580–1640), seemed to solve the problem of supplying enslaved labor to Spanish possessions throughout the world. The Rio de la Plata played an important role in the extensive route linking Angola to Potosí, which, together with its hinterland, constituted a rich market made enormously attractive by the silver mined from the mountain for which the city was named. The lure of Peruvian silver hung over the slave trade and the institution of slavery in the Rio de la Plata region throughout the entire slaveholding period. During the 1789–1812 period, local merchants and traders in leather, tallow, and timber vied for position in this profitable market.