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In page European enslavement of Indigenous Americans:

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However, the Mormons strongly opposed the New Mexican slave trade, which caused sometimes dramatic conflicts with the slave traders. When Don Pedro León Luján was caught violating the Nonintercourse Act in November 1851 by attempting to trade slaves with the Indians without a valid license, he and his party were prosecuted.[citation needed] His property was seized and the child slaves were sold to Mormon families in Manti. In another incident, Ute Chief Arrapine demanded that the Mormons purchase a group of children that they had prevented him from selling to the Mexicans. When they refused, he executed the captives.[11]