How many times have we talked about Presentism?
Pres·ent·ism
/ˈpreznˌ(t)iz(ə)m/
noun
uncritical adherence to present-day attitudes, especially the tendency to interpret past events in terms of modern values and concepts.
And, this is the problem with blanket dismissal of slavery as evil.
For much of history, slavery was a reasonable alternative for many people. In a sense, in many cultures, it was simply getting a job for life. Slavery was also something used with being a POW. That is, you lost your war, you end up enslaved by the victors as labor. Too bad for you, you shouldn't have lost. Same goes for criminals. An alternative to putting some criminal to death was simply enslave him and work him to death. Same outcome, but more productive.
Slavery makes sense when alternative, more efficient means of production aren't available. For much of history, a slave was equal to a horse in terms of requirements like food and care. That might seem unreasonable to modern sensibilities, but it's nonetheless true. Slaves were also more flexible in their usage.
If you look at Roman slavery, it's typical of the ancient period of history. Enslavement happened for a number of reasons like:
Capture in war
Indebtedness
Child abandonment (you are a child, and your parents dumped you)
Self enslavement
In any case, there were laws about the treatment of slaves as well as their use. The Roman government made use of slaves, including in bureaucracy, as part of normal practice. This is similar to China's use of eunuchs in government positions for reliability.
The American version would have died off on its own with the mechanization of farming regardless of anything else. That it went on so long, was only due to what today would amount to the equivalent of agribusiness. That is, large corporations insisting on it continuing so they could profit from it. That is, today companies like Tyson Foods, Archer Daniels Midland, and the like would be the ones wanting slavery to continue.
Today those companies use a near equivalent of illegal immigrants, fostered on by mostly Democrats--like Joke who's let close to 1 in 3 illegals in the US in in the last three years (and yes, the Republicans aren't blameless here)--where they can use and abuse them at lower than minimum wage to do the work they want done.
Slavery is far more complex than the morons on the Left make it out to be.