Political centralization and organization
Agriculture
Domestication of animals
Trade
Writing system
Road system
Calendar
Armed military force
Religion
Architecture
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Vast Empires
Most river valley civilizations accepted religion of some sort. Unfortunately, however, they also accepted slavery as a standard part of their culture.
Nile, Euphrates, Tigris, Indus.
irrigation
The first great civilizations are, arguably, ancient Egypt and Mesopotamia. What they had in common is that both were in very arid places (deserts) but centered around large rivers. They used irrigation to turn the deserts into fertile land.