The largest slave trade was on the East Mediterranean and Black sea. Turks demanded slave tax on Christian subjects - every fifth boy had to be given to sultan as slave.
Crimean Tatars ran a huge slave operation decimating Ukraine, Russia, Romania and Poland. Millions were taken to slavery.
Crimean port of Feodosia was the largest slave market anywhere.
Turkish sultans were basically prohibited to marry (to be independent) and their harem was exclusively “staffed” by Christian slave women, as Muhammad prohibits enslaving Muslims. Sick!
So where have they all gone? Black descendants of former slaves still live in the US and the West Indies. Whites in the slaving countries of the Middle East, however, not so much. Since they were doing the women, they did not produce white babies. Since the men weren’t getting any, they didn’t produce any babies. In the New World, however, the black slaves were permitted to “jump the broom,” in addition to the prettiest of the girls getting boinked by ol’ massa.