Contrary to what many people believe, terrorism is actually a very expensive business.
I found a correlation between the spreading of democracy after the fall of the Berlin Wall and the rise in slavery. Now, as countries, former Communist countries, became so-called democratic, people started to be enslaved by their own countrymen.
Decolonization actually boosted slavery. As foreign powers withdrew from the colonies, people were enslaved by their own countrymen. And we see it in Africa, we see it in Asia.