It's really sad that slavery still exists and is really prevalent, in fact there's an estimated 21 to 29 million slaves currently.
What? That's horrible!! I can't believe it! Where?
It still exists in some countries in Africa, I believe in places like Mauritania for instance.
That's very sad! I wonder why they still have slavery and why nobody does anything about it
Well, it was technically outlawed in 1981, but I think it has such a long history that people are almost accepting of it and so it continues.
I hope it will end soon. 
I do too. It's not just in Africa, though, it also exists in the USA as well, but it's better known as human trafficking and not slavery.
Yes, I know about human trafficking. 
It's quite a big problem, especially near international travel spots with large numbers of immigrants like California and Texas.
Yes, that's extremely sad. And now they keep people in cages and separate kids from parents...