With as late a POD as possible, have slavery an acceptable institution in the vast majority of the world, including major "free" nations (like the US, or an analog).
Restrictions:
1) slavery shouldn't be race based.
2) technology should be similar to OTL.
3) don't have one slave owning society just conquer the world, there should be many nations, on par with OTL.
My guess is that, in a high tech society, most slaves would be in the service industry. Garbage men, cleaning ladies, maids, butlers, exotic dancers, prostitutes (legal or otherwise), etc. There would also likely be laws ensuring certain working conditions for slaves, mainly because, without, technological progress would be slowed.
Restrictions:
1) slavery shouldn't be race based.
2) technology should be similar to OTL.
3) don't have one slave owning society just conquer the world, there should be many nations, on par with OTL.
My guess is that, in a high tech society, most slaves would be in the service industry. Garbage men, cleaning ladies, maids, butlers, exotic dancers, prostitutes (legal or otherwise), etc. There would also likely be laws ensuring certain working conditions for slaves, mainly because, without, technological progress would be slowed.