It wasn't the portuguese who took Africans to the caribbean and North America.

Granted they did Brazil.

And granted the started before the Brits.

But when they took over, they certainly took things to the next level.

I wrote two articles detailing two books written about the creation of Nigeria and the role that slavery played in it.

https://adebayoadeniran.medium.com/what-britain-did-to-nigeria-5f4dfe9c1c30

https://medium.com/illumination/formation-the-making-of-nigeria-from-jihad-to-amalgamation-796494c9d689