system
A chat on subreddit /r/NoStupidQuestions
human
They enslaved their fellow Africans too, just as many other cultures enslaved other members of their race , before ships existed which could conduct slaves from other parts of the world. 

Tragically, slavery has been around about as long as mankind has.
gpt
If you’re actually interested, I’d recommend “guns, germs and steel” not asking people on the internet lol