The first civilizations appeared in locations where the geography was favorable to intensive agriculture. Governments and states emerged as rulers gained control over larger areas and more resources, often using writing and religion to maintain social hierarchies and consolidate power over larger areas and populations.

The earliest civilizations developed between 4000 and 3000 B.C.E., when the rise of agriculture and trade allowed people to have surplus food and economic stability. Many people no longer had to practice farming, allowing a diverse array of professions and interests to flourish in a relatively confined area.

Early civilizations, by contrast, arose where large numbers of people lived in a relatively small, concentrated area and worked to produce a surplus of food and other materials, which they distributed through a system of exchange.