Here’s a portion of an editorial Baum wrote in 1890:
The Whites, by law of conquest, by justice of civilization, are masters of the American continent, and the best safety of the frontier settlements will be secured by the total annihilation of the few remaining Indians. Why not annihilation? Their glory has fled, their spirit broken, their manhood effaced; better that they die than live the miserable wretches that they are. History would forget these latter despicable beings, and speak, in later ages of the glory of these grand Kings of forest and plain that Cooper loved to heroism.