Tell me what Devshirme was. Why
do you think the Ottoman Empire
did this?

The Ottoman Empire was very powerful compared to other empires of the time, because it stretched across three continents and it influenced the world into the early 20th century Devshirme[a] (Ottoman Turkish: دوشيرمه‎, devşirme; usually translated as "child levy" or "blood tax")[3] was the Ottoman practice of forcibly recruiting soldiers and bureaucrats from among the children of their Balkan Christian subjects