*'''Religion''' - There must be a code of conduct or standard of [[morality]] to maintain civilization.
*'''Religion''' - There must be a code of conduct or standard of [[morality]] to maintain civilization.
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*People with common language, customs, government, and economy, earliest in [[Mesopotamia]] 3000 BC.
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*People with common language, customs, government, and economy, earliest in [[Mesopotamia]] 3000 BC, Northeast China (the Liao civilization), Peru (Norte Chico civilization), and Egypt.