1) pretty much every tribe is, some more than others, you pretty much always prefer your own, it's natural and trivially explainable by evolutionary psychology.
2) slavery was pretty much universal + the British empire (white people) were the first to start to put an end to it + more white people were made slaves and sold in Africa than black people were ever sent to America (Barbary slave trade) + it was largely black people selling other black people into slavery to the Americas + slavery today is largely found in African and Middle Eastern countries = you have no idea what you're talking about.
3) that is so retarded I don't know where to begin. dogs have races, horses have races, cats have races, chimps have races, gorillas have races, orangutans have races, guenons have races, wolves have races, bears have races .... .... .... most mammals have races, but according to you, humans don't, even though it takes a retard to not be able to recognize a Northern European from an Asian from a Native American from an African from an Arab from a Kiwi - you're trying to eliminate discrimination by eliminating the category, retarded is just about the only word I can use to describe that sleight of hand
