he Pyramids were built
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Different form of slavery - the form of slavery practiced in the US, Cuba and Brazil was chattel slavery - slaves only worth the value paid, invented by Arab Muslims in the A.D. 600s.
Old Kingdom Egypt practiced voluntary slavery - more like the later indentured servant practice. People volunteered because they wanted food, medicine and housing - all of which they received. When their tern was up, they either signed on again or did something else as free men
Spartacus was not a voluntary slave.