I know this is borderline ASB, but let's say in this timeline, Portugal is slightly less of a quiet little sociopath and says "nah" when they're offered African Slaves, and after that, the Atlantic Slave Trade and European enslavement of Africans never really gets off the ground. Colonialism and imperialism still exist, and, for the sake of this scenario, Africa still gets scrombled in the late 1800s, but slavery's not really a thingy, y'know?
What's this world gonna be like? How is agriculture effected? How is the world different TTL? How are places like the American South different TTL?
Edit: Did some research. Wow, the Atlantic Slave Trade screwed Africa over much, much harder than even I thought it did. Africa probably isn't going to get scrombled in this timeline, like, at all. Hell, it'll probably develop a lot like OTL's Asia (still a victim of European Imperialism, but not nearly as much as OTL).