Europe was hungry for agricultural goods it did not know how to produce. That meant enslaving knowledge as well as labour.
These industries required more labour than they could produce, creating a market for enslaved people.
They took raw goods (captives) and processed them quite literally into a marketable product (slaves). Right down to branding their shoulder
Less brutal forms of agriculture included greater numbers of female slaves. That, combined with the better health of the less brutal conditions meant babies. Children who could be put to work and did not need to be purchased
Plantations were brutal places. Food and living conditions were horrific. Add beatings, punitive reductions in rations, and no medical care and you've got the modern south. I mean. Awful conditions.
Not Miller. I thought I corrected that but I guess the internet has a long memory and won't accept my correction 🤦🏽♀️