1. The rest of the population benefitted from having jobs as overseers, bounty hunters, blacksmiths, shipping, etc. The whole damn economy was built in slavery, moron.
2. We're talking about the US. Spain imported blacks to Central America to replace the natives as slaves. The Irish were never slaves, save for some woman who wanted to marry a black man but was told her children would become slaves if she did. Indentured servitude was legally differed from slavery and the servant had lots of ways to redress grievences.
And none of this has anything to do with how slave owners tried to justify their "peculiar institution" with The Bible or gender pronouns.