Yeah, right alongside most of humanity!

The Ottoman Empire was trading in slaves, 100% legally, right to the end of the 1800s, and even though it was technically outlawed by the end of that century, they continued to trade in slaves illegally in huge numbers right up until the empire fell at the end of WWI.  In 1900, 1 person in 5 in the empire was a slave, and you could still buy female slaves on the streets of Constantinople right up to before the war started.

As I've said elsewhere, 'white guilt' is predicated on slapping on a HUGE set of historical blinders and pretending that Europeans were the only ones that invaded anyone, or enslaved anyone, or ended cultures.