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Tribalism is the state of being organized in, or advocating for, a tribe or tribes. In terms of conformity, tribalism may also refer in popular cultural terms to a way of thinking or behaving in which people are more loyal to their tribe than to their friends, their country, or any other social group.
Tribalism has been defined in engaged theory as a 'formation of being' based upon variable combinations of kinship-based organization, reciprocal exchange, manual production, oral communication, and analogical enquiry. Ontologically, it is oriented around the valences of analogy, genealogy and mythology.
The social structure of a tribe can vary greatly from case to case, but, due to the small size of tribes, it is usually involves a relatively undifferentiated role structure, with few significant political or economic distinctions between individuals.
Tribalism implies the possession of a strong cultural or ethnic identity that separates one member of a group from the members of another group. Based on strong relations of proximity and kinship, members of a tribe tend to possess a strong feeling of identity. Objectively, for a customary tribal society to form there needs to be ongoing social organization and exchange. However, subjectively, intense feelings of common identity lead people to feel tribally connected. The distinction between these two definitions for tribalism is an important one because, while tribal society no longer strictly exists in the western world, tribalism, by this second definition, is arguably undiminished. People have postulated that the human brain is hard-wired towards tribalism due to its evolutionary advantages. See Tribalism and evolution below.
Many tribes refer to themselves with their language's word for "people," while referring to other, neighboring tribes with various epithets. For example, the term "Inuit" translates as "people," but they were known to the Ojibwe by a name 'Eskimo' translating roughly as "eaters of raw meat."
Tribalism and violence
The anthropological debate on warfare among tribes is unsettled. While typically and certainly found among horticultural tribes, an open question remains whether such warfare is a typical feature of hunter-gatherer life, or an anomaly found only in certain circumstances, such as scarce resources (as with the Inuit or Arabs), or among food producing societies. There is also ambiguous evidence whether the level of violence among tribal societies is greater or lesser than the levels of violence among civilized societies.
If nothing else, conflict in tribal societies can never achieve the absolute scale of civilized warfare. Tribes use forms of subsistence such as horticulture and foraging which, though more efficient, cannot yield the same number of absolute calories as agriculture. This limits tribal populations significantly, especially when compared to agricultural populations. Lawrence Keeley notes in War Before Civilization that examples exist with low percentage rates of casualties in tribal battle. He also points out that some tribal battles were much more lethal as a percentage of population than, for example, the Battle of Gettysburg. He concludes from the data examined that no evidence consistently indicates that primitive battles are proportionately less lethal than civilized ones.
Tribalism and evolution
Tribalism has a very adaptive effect in human evolution. Humans are social animals, and ill-equipped to live on their own. Tribalism and ethnocentrism help to keep individuals committed to the group, even when personal relations may fray. This keeps individuals from wandering off or joining other groups. It also leads to bullying when a tribal member is unwilling to conform to the politics of the collective.
Socially, divisions between groups fosters specialized interactions with others, based on association: altruism (positive interactions with unrelated members), kin-selectivity (positive interactions with related members), and violence (negative interactions). Thus, groups with a strong sense of unity and identity can benefit from kin selection behavior such as common property and shared resources. The tendency of members to unite against an outside tribe and the ability to act violently and prejudicially against that outside tribe likely boosted the chances of survival in genocidal conflicts.
Modern examples of tribal genocide rarely reflect the defining characteristics of tribes existing prior to the Neolithic Revolution--for example, small population and close-relatedness.
According to a study by Robin Dunbar at the University of Liverpool, primate brain size is determined by social group size. Dunbar's conclusion was that most human brains can only really understand an average of 150 individuals as fully developed, complex people (Known as Dunbar's number). In contrast, anthropologist H. Russell Bernard and Peter Killworth have done a variety of field studies in the United States that came up with an estimated mean number of ties, 290, that is roughly double Dunbar's estimate. The Bernard–Killworth median of 231 is lower, due to upward straggle in the distribution, but still appreciably larger than Dunbar's estimate. 
Malcolm Gladwell expanded on this conclusion sociologically in his book, The Tipping Point where one of his types - Connectors - were successful due to their larger than average number of close friendships and capacity for maintaining them which tie otherwise unconnected social groups together. According to these studies, then, "tribalism" is in some sense an inescapable fact of human neurology, simply because many human brains are not adapted to working with large populations. Once a person's limit for connection is reached, the human brain must resort to some combination of hierarchical schemes, stereotypes, and other simplified models in order to understand so many people.
Nevertheless, complex societies (and corporations) rely upon the tribal instincts of their members for their organization and survival. For example, a representative democracy relies on the ability of a "tribe" of representatives to organize and deal with the problems of an entire nation. The instincts that these representatives are using to deal with national problems have been highly developed in the long course of human evolution on a small tribal scale, and this is the source of both their usefulness and their disutility. Indeed, much of the political tension in modern societies is the conflict between the desire to organize a nation-state using the tribal values of egalitarianism and unity and the simple fact that large societies are unavoidably impersonal and sometimes not amenable to small-society rules.
In complex societies, this tribalistic impulse can also be channelled into more frivolous avenues, manifesting itself in sports rivalries and other such "fan" affiliations.
In the past 50 years, anthropologists have greatly revised the understanding of the tribe. Franz Boas removed the idea of unilineal cultural evolution from the realm of serious anthropological research as too simplistic, allowing tribes to be studied in their own right, rather than stepping stones to civilization or "living fossils". Anthropologists such as Richard Borshay Lee and Marshall Sahlins began publishing studies that showed tribal life as an easy, safe life, the opposite of the traditional theoretical supposition. In the title to his book, Sahlins referred to these tribal cultures as "the Original Affluent Society," not for their material wealth, but for their combination of leisure and lack of want.
This work is for the progression of humanity and the enlightenment of ourselves, such as that advocated by John Zerzan or Daniel Quinn. These philosophers have led to new tribalists pursuing what Daniel Quinn dubbed the "New Tribal Revolution". The new tribalists use the term "tribalism" not in its widely thought of derogatory sense, but to refer to what they see as the defining characteristics of tribal life: namely, an open, egalitarian, classless and cooperative community. New tribalists insist that this is, in fact, the natural state of humanity, and proven by two million years of human evolution.
- http://oxforddictionaries.com/definition/english/tribalism?q=tribalism Definition of tribalism; http://www.macmillandictionary.com/dictionary/british/tribalism Definition of tribalism by Macmillan dictionary]
- James, Paul (2006). Globalism, Nationalism, Tribalism: Bringing Theory Back In. London: Sage Publications.
- Max Gluckman (2007). "Social beliefs and individual Thinking in Tribal Society". In Robert A. Manners; David Kaplan. Anthropological Theory. Transaction Publishers. pp. 453–464. ISBN 978-0-202-36133-8.
- Kanakasena Dekā; Kanakasena Ḍekā (1993). Assam's Crisis: Myth & Reality. Mittal Publications. pp. 90. ISBN 978-81-7099-473-2.
- Erich Fromm; Michael MacCoby (1970). Social Character in a Mexican Village. Transaction Publishers. pp. xi. ISBN 978-1-56000-876-7.
- "STYLE SECRETS OF THE GANGS : The truth behind tribal fashion". MODE. shortlist.com.
- Karen Lowther; Evan-Moor Educational Publishers (2003). Native Americans: Grades 1-3. Evan-Moor. pp. 14. ISBN 978-1-55799-901-6.
- Douglas P. Fry (2007). Beyond War: The Human Potential for Peace. Oxford University Press. pp. 114–115. ISBN 978-0-19-530948-5.
- Lawrence H. Keeley (1997). War Before Civilization. Oxford University Press. pp. 15–16. ISBN 978-0-19-988070-6.
- Kumar Suresh Singh (1982). Economies of the tribes and their transformation. Concept. pp. 22.
- Lawrence H. Keeley (1997). War Before Civilization. Oxford University Press. pp. 63–65. ISBN 978-0-19-988070-6.
- Dunbar, Robin I. M. (2010). How many friends does one person need?: Dunbar's number and other evolutionary quirks. London: Faber and Faber. ISBN 0-571-25342-3.
- McCarty, C.; Killworth, P. D.; Bernard, H. R.; Johnsen, E.; Shelley, G. (2000). "Comparing Two Methods for Estimating Network Size". Human Organization 60 (1): 28–39.
- Bernard, H. Russell; Shelley, Gene Ann; Killworth, Peter (1987). "How Much of a Network does the GSS and RSW Dredge Up?". Social Networks 9 (1): 49–63. doi:10.1016/0378-8733(87)90017-7.
- H. Russell Bernard. "Honoring Peter Killworth's contribution to social network theory." Paper presented to the University of Southampton, 28 September 2006. http://nersp.osg.ufl.edu/~ufruss/
- James, Paul (2006). Globalism, Nationalism, Tribalism: Bringing Theory Back In. London: Sage Publications.
- James, Paul. et al., Sustainable Communities, Sustainable Development: Other Paths for Papua New Guinea (2012) pdf download
- Sow, Adama: Ethnozentrismus als Katalysator bestehender Konflikte in Afrika südlich der Sahara, am Beispiel der Unruhen in Côte d`Ivoire at: European University Center for Peace Studies (EPU),Stadtschleining 2005 (German)
- "The New Tribalism" by University of Oregon president Dave Frohnmayer, condemning a "new tribalism" in the traditional sense of "tribalism," not to be confused with "new tribalism".
- "Tribalism in Africa" by Stephen Isabirye
- "Tribalism on the terrace" An article in Greek about soccer tribalism in Britain
- "KENYA: It’s the economy, stupid (not just “tribalism”)" An IRIN article on post election violence in Kenya - January 2008
- Steven Pressfield, "It's the Tribes, Stupid" (five part video series)