Hi, my grandfather used to work in a cotton plantation. 
wow, which one?
In a Minnesota plantation. But it is closed now, because of slavery issues.
Slavery was still legal when independence was declared in 1776
Yea I am glad its abolished now. It was a very bad system.
Yeah it was. Apparently slavery started in ancient Mesopotania
Did it? I thought it started in Egypt. Does slavery still exist in parts of the world?
I'm not sure but it's rare among simple tribes because it was invented as a hierarchy
I see, but now there are better to implement a hierarchy than to make people slaves!
Absolutely! Unfortunately slavery was practised by many cultures and faiths