Depends a lot on how you define the "recent history" period and in what locations? Slavery existed on all continents (except Australia I think?) long before th

Depends a lot on how you define the "recent history" period and in what locations? Slavery existed on all continents (except Australia I think?) long before the expansion of Christians started. Antic Mediterranean had slaves. Scandinavia nations had slaves. Mongolian and Chinese empires had slaves. North and South American native civilizations had slaves. Also the Christian slave traders of 13th - 19th century cooperated heavily with Arabs and natives to run the slave raids for them. At the same time Ottoman Empire also used slaves, as well as kidnapping children to serve as soldiers, just it's far less known in the West as it didn't affect Westerners.