The evolution of complex cultural systems is marked by a number of
broad, sweeping patterns that characterize many different cultures at
different points in time across the globe. Over the course of the past
100,000 years, there has been a general evolutionary trend for cultural
systems to get larger and more complex. A consistent element in the
broad course of cultural evolu- tion has been the emergence and
subsequent development of centralized forms of political organization.
The record of the first modern humans illuminates a global wide pat-
tern of relative social equality and decentralized deciSion-making
processes. Prior to about 10,000 years ago, there are no indications of
clear social, political, or economic hierarchies. In these early
millennia archaeological markers of social ranking are lacking and there
is a similar absence of evidence pointing to the presence of leaders,
chiefs or rulers. The pattern of social equality began to change at
different moments and at different rates in various parts of the world
in the course of the last 10,000 years. In some areas, such as
Mesopotamia, politically centralized hierarchies emerged very early and
developed rapidly, while in others, such as the Arctic, political
centralization never emerged outside the context of Western colonialism.
In every culture area, the origins and development of politically cen-
tralized social systems and the emergence of leaders and rulers followed
a unique evolutionary trajectory depending on local history and
environment.