Well, Slavery still exists in Africa. One thing to consider if slavery didn’t ever exist the tribes would be just killed the ones they captured.
The Arabs should pay as they are the ones who sold them.
India has 18 million modern slaves—at least five times more than any other country in the world
By Manu BalachandranMay 31, 2016
India is home to the largest number of enslaved people in the world.
A little over 18 million people—equal to the entire population of Chile—are victims of modern slavery in Asia’s third-largest economy, according to the Global Slavery Index (pdf), published by Australia-based human rights group Walk Free Foundation. Such persons are often engaged in domestic work, construction, farming, fishing, manual labour, forced begging, and in the sex industry.
Thanks for the mention.