Also, when you use the N word, are you referring to black people in particular? Every human being, regardless of skin color, can trace their roots to the African continent, white people didn't just plop from the sky, despite what followers of White Jesus would have you believe. Saying "all races practiced slavery" neither excuses white supremacy, nor does it negate the fact that white people ran the slave trade in America.
That is just a hypothesis, it has not been even proven true.
Go figure out, you are not not well versed in the subject for a serious discussion at the moment. All you are doing is find an excuse to justify the genocide of the Aryan people in their own homelands.