civilization in northeastern Africa that dates from the 4th millennium bce
dependent on the annual inundation of the Nile River to support its agricultural population
Agriculture centered on the cultivation of cereal crops, chiefly emmer wheat and barley
Basin irrigation was achieved by simple means, and multiple cropping was not feasible until much later times
Most Egyptians were probably descended from settlers who moved to the Nile valley in prehistoric times, with population increase coming through natural fertility
Slavery was never common, being restricted to captives and foreigners or to people who were forced by poverty or debt to sell themselves into service
construction of the great pyramids in the 4th dynasty (c. 2575–c. 2465 bce)
uneven distribution of wealth, labour, and technology was related to the only partly urban character of society