@theilikepie Let's talk seriously. Why slavery was reduced worldwide? Because the colonial countries figured they wanted to get rid of it by declaring war on the countries that wanted to keep it.
Why is there no slavery now? Because the countries gathered in the World Trade Organization said that without a minimum level of humanitarian values, we will not trade with you. However, this rally inside this organization has been waning since China was adopted.
In this story, slavery is held by magic. Additionally, the standard of living is degenerating. In such conditions, slavery in this world because there is no power to free the slaves, and the social system did not collapse.
Your comment speaks of your morality and morality changes with social changes and if international trade collapses due to wars and climate disasters, slavery will return