And illegal immigration in the US is . . . well, against the law.
But we have 10 million or more illegal immigrants in the US for a reason: it is permitted. By the federal government (until 9 months ago). And by a lot of people in US society.
You are right, de jure slavery has been eliminated, if you accept the contention that governments like North Korea do not use slave labor.
The reported 40 million slaves that exist today are in bondage de facto.
Still, you would have to say they are slaves.
I guess you could deny they are slaves.
Murder exists in our society - but I can assure you - it's NOT 'permitted'. Not to belabor the point but 'laws' are not created by 'polls' or 'norms'... To talk we have to accept standard definitions of terms.
That said, I'll give you the point on North Korea. What the Norks engage in is so close to 'slave labor' that it might as well be slave labor. You win that one.