Who was sold into enslavement after a local or tribal war?

What you describe happened mostly to Africans

If Africans waged war against other nations, the other nations that won would enslave the people and sell them on the market. If they waged war between themselves, the stronger tribes would enslave the weaker tribes and sell them to the slave market even though they are more or less neighbors.

It depends on what you believe, if you’re christian that you would have been told that the first humans were created by god and that we’re all decedent's from adam and eve but scientist say otherwise