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In page Indigenous peoples in Brazil:

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After Rondon's pioneering work, the SPI was handed over to bureaucrats and military officers, and its effectiveness declined after 1957. The new officials did not share Rondon's deep commitment to the Amerindians. Instead, the SPI sought to integrate tribal groups into mainstream Brazilian society. The promise of wealth from reservation lands attracted cattle ranchers and settlers, who continued encroaching on Indigenous territories, with the SPI facilitating this intrusion. Between 1900 and 1967, an estimated 98 Indigenous tribes were wiped out.[citation needed]