Post Babylonia, so I'm told
Babylonia was an ancient Semitic nation state and cultural region based in central-southern Mesopotamia. Ab-Soul believes that since then, human civilisation has not progressed much and has actually regressed.
It’s quite possible that his doubt in what is classified as ‘'Post Babylonia’‘ may be suggesting that the culture was just as advanced as we believe ourselves to be, and 'new age’ inventions, were actually taken from Babylonia texts and relics.
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