A press release from group states, "This fall in schools across America, students will be watching PragerU videos in their classrooms as states officially make PragerU an approved educational resource."
Despite its name, PragerU is not an accredited academic institution, nor does it issue degrees.
Even in grade school the history books talking about slavery in ancient Rome spent a lot of undue time talking about the wonderful exceptions and the way some slaves freed themselves (thought gladiatorial combat or other Survivorship Bias means) to make it seem less fucked up.
Oh definitely, though I remember receiving emphatic stories also about some holiday in the Aztec Empire where slaves could free themselves via foot race for some reason.
This is just a guess, but on a continent without horses a guy who can run really fast is really useful to have around, and hard to keep as a slave if you want to make use of that skill