Jesuit missions among the Guaraní

The Jesuit missions among the Guaraní were a type of settlement for the Guaraní people ("Indians" or "Indios") in an area straddling the borders of present-day Argentina, Brazil and Paraguay (the triple frontier). The missions were established by the Jesuit Order of the Catholic Church early in the 17th century and ended in the late 18th century after the expulsion of the Jesuit order from the Americas. The missions have been called an experiment in "socialist theocracy" or a rare example of "benign colonialism". Others have argued that "the Jesuits took away the Indians' freedom, forced them to radically change their lifestyle, physically abused them, and subjected them to disease".

In their newly acquired South American dominions, the Spanish and Portuguese Empires adopted a strategy of gathering native populations into communities called "Indian reductions" (Spanish: reducciones de indios, Portuguese: reduções). The objectives of the reductions were to impart Christianity and European culture. Secular as well as religious authorities created "reductions".

The missions among the Guaraní are often called collectively the Río de la Plata missions. The Jesuits attempted to create a "state within a state" in which the native peoples in the reductions, guided by the Jesuits, would remain autonomous and isolated from Spanish colonists and Spanish rule. A major factor attracting the natives to the reductions was the protection they afforded from enslavement and the forced labour of encomiendas.

Under the leadership of both the Jesuits and native caciques, the reductions achieved a high degree of autonomy within the colonial empires. With the use of native labour, the reductions became economically successful. When the incursions of Brazilian Bandeirante slave-traders threatened the existence of the reductions, Indian militias were set up, which fought effectively against the Portuguese colonists. However, directly as a result of the suppression of the Society of Jesus in several European countries, including Spain, in 1767, the Jesuits were expelled from the Guaraní missions (and the Americas) by order of the Spanish king Charles III. So ended the era of the Paraguayan reductions. The reasons for the expulsion related more to politics in Europe than to the activities of the Jesuit missions themselves.

The Jesuit Río de la Plata reductions reached a maximum population of 141,182 in 1732 in 30 missions in Brazil, Paraguay, and Argentina. The reductions of the Jesuit Missions of Chiquitos, in eastern Bolivia, reached a maximum population of 25,000 in 1766. Jesuit reductions in the Llanos de Moxos, also in Bolivia, reached a population of about 30,000 in 1720. In Chiquitos, the first reduction was founded in 1691 and in the Llanos de Moxos in 1682.