The original name for Volunteer. During the time of Pharaohs they would request help from the people and they would slave for the Pharaoh. Slave means Volunteer their services. This did include payment for their service which as written in hieroglyphs means a Slaves Wage. So Slaves where paid for their volunteer work.
*NOTE: This is not to be confused with Barbaric Brutality, Bondage, or Prisoners of War. None of these things are related to slavery and Americans,Europeans,Romans/French/Italians,Greeks/Arabs and affiliates of Islam try to claim this is. Slavery has nothing to do with chaining up people, physical abuse or manipulation through lies,torture,or blackmail.*
People in the Sahara Forest need water to for their crops an we use the Pyramids to electrify the water to become Rain. We need another Pyramid Who will slave for these suffering people.