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Evolution of methods of subjection perhaps and evolution of how to rationalize it in the minds of those who cater to various methods of the acquisition of enormous wealth is all I see. He fails to mention the various methods used to keep subjected peoples in their lowly places, the stripping away of basic human rights and needs etc so really, often exactly the reverse can be shown to be true in regard to evolution of intellectual powers, how a dignified person can be made to behave like an animal...
People love to think slavery's the only means of subjugating others. It's often overlooked that different methods of subjugation were practiced in Ireland & India. A large array of tools have been developed. It's a shame most people don't recognize the current favorites for what they are.

Dark Matter + Dark Energy = Dark Truth

"We find that such evidence demonstrates that the ID argument is dependent upon setting a scientifically unreasonable burden of proof for the theory of evolution." - Judge Jones Kitzmiller case
http://www.talkreason.org/articles/Falsify.cfm

"To Compel A Man To Furnish Funds For The Propagation Of Ideas He Disbelieves And Abhors Is Sinful And Tyrannical." - Thomas Jefferson

"And can the liberties of a nation be thought secure when we have removed their only firm basis, a conviction in the minds of the people that these liberties are the gift of God? That they are not to be violated but with his wrath?" - Thomas Jefferson