I adore you Leon, Egyptologist here, they were built by a largely volunteer force (corvée labor) of 25,000. The builders were very well fed, paid in bread and beer, and received excellent medical care. There was no slavery whatsoever, it is a common misconception.
um, so everyone cheering on egypt in the world cup realizes how the pyramids were built right? but i guess that's a conversation you're not ready to have