No problem for the West Africans.
They just went back to enslaving their own cousins, which they had been doing for more than 100,000 years, before the Europeans showed up around 1500 A.D.
“They forgot to mention that the British Navy impeded, then completely halted, the West Africa slave trade, more than 200 years ago!”
Yep, hence the Resolute desk in the oval office. The Royal Navy stopped the Trans-Atlantic (with some help from the US Navy) slave trade. Then the British crushed the slavers in East Africa, I’m looking at your Luo tribe Barky. Damn ingrates.