Look up any UN report and you’ll see it. The UN may not act upon it, but it is well known that the only countries where slavery is legal are Muslim countries.
One of the interesting things is that the new Egyptian constitution (unlike the old one) did not ban slavery.
Sexual slavery and human trafficking is a worldwide problem. It's not legal in the Philippines, or India, or Los Angeles, or China, or Cambodia, or Eastern Europe. Brick-making slavery isn't legal in India.
The boy soldiers of African are forced to serve. Do we count that as legal slavery?
We have caste slavery in India and Nepal, and slave migrant workers in Indonesia.
Slavery exists in some form in every country.