For me, it isn't so much about who invented it as it is about who took the most advantage of it and did the most damage.
And as a West African who's read about many European countries making a beeline for my country and neighboring countries, it's hard to keep a civil tongue on your view here. But I'll do just that, and give you the benefit of the doubt: you can't tell the whole truth in a three-minute read.
The biggest truth about slavery is definitely not about who invented it. That'll sound like absolving the white man of their unforgivable evil deeds along the topic of slavery.