What role did bartolome de las casas play in the treatment of Native Americans

Bartolomé de Las Casas (c. 1484–July 18, 1566) was a Spanish Dominican friar who became famous for his defense of the rights of the Indigenous peoples of the Americas. His brave stand against the horrors of the conquest and the colonization of the New World earned him the title “Defender of the Indigenous peoples."

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a.that is my answer.

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i confess that there are several parts of this constitution which i do not at present approve, but i am not sure i shall never approve them: for having lived long, i have experienced many instances of being obliged by better information or fuller consideration, to change opinions even on important subjects, which i once thought right, but found to be otherwise. it is therefore that the older i grow, the more apt i am to doubt my own judgment, and to pay more respect to the judgment of others.