Yes he will need his body in the spirit world and i know this because the ancient Egyptians believed that their body was part of entering the spirit world .
Sargon's empire became too large for him to control.
I believe it became common because as civilizations grew from food abundance and population growth, the civilizations wealth in how they produced it, usually by trade in food needed to be contained. So economic specialization was needed so that their prosperity could be controlled.
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Hope this helps click on the picture to get a full view. My phones glitchy glad I can type this much!
