That is exactly what happened. Tribal leaders kidnapped people from other tribes to sell as slaves.
The British intervened to save slaves when slavery was abolished here.
But noone should pay anything. I mean who's with me to start a campaign to get Rome, Anglo, Saxons, Viking nations etc to pay us for what thry did to the indigenous Brits? And don't think none of those Brits weren't in servitude/enslaved. They were. Viking nations used to kidnap British females to be the wives of men back home.
When I worked in Zambia, I was shown all the slavery places by the engineer I was working with. The tree where slaves were tied in readiness for slavers buying them etc. I asked how they felt about slavery and was told - there are 7 tribes in Zambia. We used to all fight amongst ourselves. We could not marry across tribes etc. We all had our own language. We now all speak English. We are one nation and can marry anyone. Ergo that person, at least, was happier with the way the country was. He married a woman from a different tribe.
Frankly I'm done with all talk of paying for slavery. History is history, none of us were around to feel responsible. Sure it's very uncomfortable to know that's what our ancestors did, but equally the British ended slavery and enforced it, so grateful William Wilberforce for taking action in 1787 which resulted in anti slavery legislation in 1807.
Slavery is still ongoing today, right under our noses - sex workers, car washes, nail salons, local construction companies using asylum seekers, people with learning disabilities being used by their so-called friends etc. Some humans will use other humans to bring them 'riches'. It's those humans we need to seek out and deal with.
A historian told me Britain should apologise for plundering nations in the Commonwealth. I'm not sure an apology is what they really want - we should return treasures we have taken (not those the Royals or Britain were gifted) like the Elgin stones. And America should give us our Eagle back.
History is fascinating and can be dark, but it's history. No need for hysterics.