The final and most complex category was the state level. The defining factor between chiefdoms and states (especially in the case of larger more complex chiefdoms) can be difficult to draw. This is because the state reflected an expansion and deepening of tendencies already present in a chiefdom. The growth of the division of labor and specialization, indicated by the formation of artisan groups who no longer engaged in farming, the rise of the priesthood, the rise of a distinct warrior class, and bureaucracy entrusted with the administration or the state. The state-level required a technological base of high productivity usually intensive agriculture that made large use of irrigation, terracing, and other advanced technologies. The state suffered from the chiefdom in its larger size and population, the increased exchange of goods between regions, sometimes accompanied by the emergence of a professional merchant class and the rise of true cities. The Aztec, Maya, and Inca societies offer the best-known examples of the state level of organization.