Slave Labor Was Cheap in Ancient Egypt
Greek theorists were just as much in awe of these giant Pyramids as we are thousands of years later. They stipulated that the Pharaohs must have a constant supply of slaves to ensure the construction of the Pyramids.
Source: twitter.com
Historians Herodotus and Diodorus Siculus researched the Pyramids and wrote a detailed account of how they believe it was constructed.