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1517
"Negro slavery is sanctioned by the King of Spain & substituted in the Spanish American colonies for that of the Aborigines. The savages who had been made slaves and compelled to work in the Spanish mines, are liberated. _ These measures had been strongly & zealously advocated by Father Delas Casas, not on the ground that slavery was at all commendable or justifiable, but because he believed that the sum of human wretchedness would be far less in America if African slavery were substituted for that of the natives." Long's Chron: 82.