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Through all the early 17th century slave hunters "bandeirantes" from São Paulo attacked the reductions created in the Plata Basin by Spanish Jesuits in order to convert the Guarani peoples. At the time Portugal was under the Iberian Union with Spain, and so the protest of the Jesuits didn't have an effect in Madrid at first because many Spanish colonial authorities and merchants actually shared the profits made by this slave trade with the Portuguese - even a bishop of Paraguay received money to keep his mouth shut about it.

Until 1638 the Portuguese were successful to destroy the reductions of Itatin (in the OTL Brazilian state of Mato Grosso do Sul), Guaira (Paraná) and Tape (Rio Grande do Sul). However, that year the Spanish king Philip IV finally decided to accept the requests of the Jesuits, and allowed them to give training and guns to the Guarani. Thanks to this, when in 1641 3,000 Bandeirantes and their allied Tupi tried to attack the reductions located between the rivers Uruguay and Paraná they were defeated by 4,000 armed Guarani at the eight days long Battle of Mbororé (nowadays in Missiones, Argentina). The battle halted Portuguese expansion in the region for a century, allowed the Jesuitic Missions to survive and later expand again towards the territory of nowadays Rio Grande do Sul.

But WI Philip IV hadn't been convinced about allowing the Guarany to use arms, resulting in a successful Portuguese attack in 1641? Could the territory of the missions in the right side of the Uruguay River fall to the Portuguese sphere, as happened with Guaira and Itatin? Would the Guarany be relocated to Paraguay or other place? And how could it affect the Reductions system?
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