There was plenty of white vs. black wars
British vs. Zulus
French vs. Haitians
Italians vs. Ethiopians
Romans vs. Egyptians
Romans vs. Carthage
Romans vs. Nubians
Whites vs. Seminoles (blacks and NAs)
Spanish (Catholics) vs. North Africans (Moors)
Blacks stood up to Europeans. Europeans just went through their Industrial Revolution a century before everyone else. They had superior technology. The Natives were sitting on valuable land that whites wanted and even though it was really the disease whites brought with them that killed the Natives, eventually they would have taken the Americas regardless if they had to bomb every last NA tribe out of existence
Europeans didn't take Africa because for one, the climate is too hot for them to live in. For two, the diseases down there that Africans built a tolerance too would have killed them. For three, they felt more comfortable creating arbitrary nations to stake a claim on their portion of the rich minerals/resources in Africa instead of flat out eradicating the entire black race. But if they really wanted to, they could have done the same thing to Africans that they did to Native Americans. It was an unfair advantage. It would be like some country having alien technology right now while everyone else was using our human tech thinking it's advanced. Imagine North Korea with alien tech