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Although difficult to prove, it seems that both the North-American Indians, the Aborigines and the bush men of South Africa (all hunter-gatherers) made extraordinary bad slaves, even though some agricultural groups living in the same regions did manage to adapt to the slave system. Often this meant these hunter gatherer groups were virtually wiped out as they could serve no purpose for the invaders.
Assuming this is true, why couldn’t the individuals in these groups perform as slaves, even when their lives depended upon it?
For my best guess approach, see Decoding Humanity: A Short Story of Individual Motivations, Groups, and Societies.