You don't know what slave trade was/is. Borders exist for a reason.
You dont know anything about slavery today.
Your beloved private sector literally sells slaves to construction companies in Dubai.
The only complains I've heard are that you can't get citizenship. What I like most is that people doing "funny" business are quickly deported. You don't see homeless people or beggers on the streets either.
I wonder, why Europe can't do that? I don't think there would be much push-back against migrants if we would have an efficient deportation system(i.e deport them after visa expiration or when they get involved in criminal activities).
Because some white men drew them on maps....
Sykes-Picot was a disaster for the middle east.