Classification and Evolution of Human Societies

Key Insight

Human societies can be broadly categorized into bands, tribes, chiefdoms, and states, representing an evolutionary continuum over the past 13,000 years. At the end of the last Ice Age, most of the world's population lived in societies similar to modern bands. As recently as AD 1500, less than 20 percent of the world's land area was organized into states; today, all land except Antarctica is state-divided. Descendants of societies that developed centralized government and organized religion earliest ultimately dominated the modern world, as these, along with germs, writing, and technology, served as key agents in shaping history's broad patterns.

Bands are the simplest and smallest societies, typically comprising 5 to 80 closely related individuals, essentially an extended family or several such families. They are nomadic hunter-gatherers, lacking permanent residences, and utilizing land jointly. There is no regular economic specialization beyond age and sex, and no formal institutions like laws or police to resolve conflicts. Band organization is often described as 'egalitarian' because leadership is informal, based on personal qualities like strength or intelligence, and there is no social stratification. Examples include the Fayu of New Guinea, African Pygmies, San hunter-gatherers, Aboriginal Australians, and Eskimos. Their numbers are kept low by factors such as disease (e.g., malaria) and limited resources, forcing nomadic movements.

Tribes represent the next stage, being larger (typically hundreds of people) and usually having fixed settlements, though some can be seasonal herders. They consist of multiple formally recognized kinship groups or clans, with land belonging to specific clans rather than the whole tribe. Within a tribe, everyone typically knows everyone else by name and relationships due to blood or marriage ties, which help mediate conflicts without formal police or laws. Like bands, tribes maintain an informal, 'egalitarian' system of government with communal decision-making and influential 'big-men' whose power is limited and not inherited. They lack bureaucracy, police, and taxes, relying on reciprocal exchanges and exhibiting slight economic specialization, with all able-bodied adults, including big-men, participating in food production.