The invention of slavery

41ncnodwApL._SY344_BO1,204,203,200_My main gripe with Inventing the Individual: The Origins of Western Liberalism, is that I don’t think individualism is a sui generis invention of Western civilization (the author, Larry Siedentop, gives particular pride of place to Western Christianity as the mother and midwife of liberal individualism). It’s hard to generalize about human nature and history without portraying cut-outs, but I’ve contended for over ten years now that basal, constitutive, and modal, human nature is already quite individualistic. Western liberalism is a rediscovery or excavation, not a novel creation.

Yes, as per The Secret of Our Success humans are very social creatures. But ultimately that sociality redounds to individual success (e.g., positional games/status hierarchies take up more time and energy than coordinating to achieve group success). Western civilization’s individualistic ethos is to my mind a reversion to a more primal norm, as dense human living became less constrained by the eternal Malthusian traps of the agrarian civilizations which arose after the Neolithic. Individualism and wealth go hand and hand.

41ezBQHrx7L“Traditional” customs and values which were handed down to early moderns by their ancestors were cultural adaptations to novel ecologies that were the product of dense existence on the Malthusian limit. There may be limitations to the classical evolutionary psychological conception of the “Pleistocene mind,” but I suspect that the emotional importance of friendship and pairbonds between mates existed during that period, and were ubiquitous. I say this because platonic and romantic love don’t seem to be learned in any deep sense, but are naturally evoked out of our cognitive hardware. And yet norms, values, and rituals over the past 10,000 years have constrained the importance of love, because individual interests can sometimes be at cross-purposes with group/social interests. The friendship between Cú Chulainn and Ferdiad should naturally transcend divisions of honor, obligation, and nationality. Yet in early Iron Age Ireland they do not. The dramatic tension at the heart of Romeo and Juliet, or Tristan and Iseult, arises because of the reality that almost everyone can relate to the individuals whose preferences and needs are constrained and thwarted by considerations of family, religion, or ethnicity (the substitution of divine love for most is probably not an equal value substitute, with all due to respect to god).

The_10,000_Year_Explosion_(Cover)Complex societies are a big deal. They’ve changed the genetic makeup and characteristics of humans a fair amount. But cultural evolution is even more plastic, pliable, and adaptive. Human cultures are protean, and rearrange preexistent cognitive furniture in a manner which makes them functional for a particular time and place. Much of this comes together during the Axial Age with the evolution of “higher religion.” These cultural innovations fused multiple strands together into a very robust alloy. Philosophy compelling to the literate castes was deftly interleaved with devotionalist theism which appealed to the masses and proffered fictive kinship, hammered together by mass ritual, and scaffolded in the institutional frameworks of the despotisms and oligarchies of the age.

41YXHblIQEL._SY445_QL70_I doubt that humans are naturally egalitarian. We strive for excellence, and engage in individual and intergroup competition. But our penchant for rank and status exhibits constraint and moderation. Humans are social apes, and if an “alpha male” gets too big for his britches, then a coalition of subordinate males is likely to topple him. I presume this sort of equilibrating system operated for most of the Pleistocene…but things began to change during the Holocene. Big men became despots. Peter Turchin has argued in UltraSociety that the despotisms of the Bronze Age were unstable, with the consequences for toppling catastrophic. Universal religion, which allowed for constraint on autocrats by positing an ethical principle or supernatural agent above the king or emperor, was a cultural innovation that allowed for greater stability. Sometimes the adaptation was peculiar; both the Imperial Romans and early Muslims avoided the term “king” for rhetorical reasons, even though the princeps and caliphs were kings in all but name.

Evolutionary processes in complexes species generally involves an element of intraspecific competition. Some would even posit that in many cases this is the dominant dynamic driving evolutionary change. But the invention of a caste of slaves, and masses of servile peasants, to serve a small elite, was a feature of agricultural civilization. This was no natural consequence of natural competition.

We know all this happened. The current project has to be to understand how it happened. Why it happened.

A new paper in Nature Genetics sheds light on a critical piece of the puzzle, Punctuated bursts in human male demography inferred from 1,244 worldwide Y-chromosome sequences. The figure below communicates the main results:

Screenshot 2016-04-25 21.40.08

In some ways this seems an incremental improvement over last year’s A recent bottleneck of Y chromosome diversity coincides with a global change in culture. Much of the detail of this current paper, and why it adds to earlier work, can be found in the supplements.

The major takeaway is again you see evidence in Y chromosomal male lineages of incredibly rapid and explosive demographic growth. This is the rise of patriarchy, the arrival on the scene of despotic lineages which monopolized access to a disproportionate amount of the goods and services of many societies, including women.

In the plot above three lineages jump out at you. E1b, R1a, and R1b. The first is associated with the Bantu expansion, that occurred over the last 4,000 years. The second two are likely associated with Indo-Europeans in both Asia and Europe, respectively. The timescale is on the order of 4 to 5,000 years in the past. The association between culture and genes, or the genetic lineages of males, is rather clear, in these cases. In other instances the growth was more gradual. For example, the lineages likely associated with the first Neolithic pulses, J and G. Interestingly, the authors of the paper notice that the same is true in East Asia. Here one sees a more gradual accumulation of genetic mutations as lineages branch out from each other at a stolid pace, a sharp contrast to the explosive “star phylogeny” that is the case for R1b and R1a. This is almost certainly due to the differences in the cultural revolutions, and the reproductive success that that allowed a given male.

Finally, the authors suggest that haplogroup E, which is today the dominant lineage within Africa, though it is found in the Middle East and Europe, is the product of a back migration ~50,000 years ago. The argument is from parsimony. E and D are clearly a clade, and D is found in Japan (and also Tibet and Southeast Asia). If E originated in Africa, and later spread to Europe, so did D. Rather, the authors favor the model that E is a basal Eurasian haplogroup which percolated back into Sub-Saharan Africa during the Pleistocene. It would not be surprising that Southwest Eurasian humans would maintain contact with nearby African populations, but this sort of phenomenon does seem to point to the possibility for a Levantine origin for modern humans!

This is all based on contemporary DNA, and contemporary distributions of populations. There may have been mass extinctions which hide from our perception other demographic revolutions. Additionally, if there is one thing that ancient DNA has taught us, it is that modern distributions may not reflect ancient ones. Nevertheless, this is a good step in understanding the cultural changes which have resulted in the world we see around us.

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