How did early river valley civilizations influence later civilizations?

There are four
main river valley civilizations that changed the path of human existence; these developing
regions are referred to as "the cradles of civilization." The four river civilizations
are Mesopotamia, the Nile River Valley Civilization, the Indus Valley Civilization, and the
Yellow River Valley Civilization.

These civilizations developed the idea of
the city-state and what was necessary to make the city-state function. This included religion,
social structure, a specialized...

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