Most river valley civilizations accepted religion of some sort. Unfortunately, however, they also accepted slavery as a standard part of their culture.
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irrigation
The Nile River Valley was the seed of civilization. +++ I don't think the Ancient Egyptians were the first - e.g., China!
The geographic factor that was most important to the development of the early river valley civilizations would be the river. This is because it gave them fertile soil to grow crops.
The majority of the river civilizations of the ancient times had a King or an Emperor from the Sumer to Assyrian right through the Achaemenide Persian Empire.
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