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In page Slavery in Brazil:

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Soon after the arrival of the Portuguese, it became clear a commercial colonial undertaking would be difficult on such a vast continent. Indigenous slave labor was quickly turned to for agricultural workforce needs, particularly due to the labor demands of the expanding sugar industry. Due to this pressure, slaving expeditions for Native Americans became common, despite opposition from the Jesuits who had their own ways of controlling native populations through institutions like aldeias, or villages where they concentrated Indian populations for ease of conversion. As the population of coastal Native Americans dwindled due to harsh conditions, warfare, and disease, slave traders increasingly moved further inland in bandeiras, or formal slaving expeditions.[citation needed]