It's probably a different discussion for a different thread. Has to do with the definition of "power", which isn't really the topic.
However - your usage of the word implies political power, as distinct from personal power. Personal power is when three guys with shotguns abduct someone and tie him to either a car or a tree. But political power is when the law says blacks are only 3/5 human.
In my view, both are racist. My question is, are they directly related.
Globally speaking, and historically, slavery is a time honored tradition going back to before the Hebrews in 1000 BC. There are those who view slavery as an economic institution rather than a racial one, in other they don't much care who they enslave as long as someone's working. (And they'll whip you no matter what color you are). This view is not 'exactly' racism even though it's still being a miserable human being.
Here in America, the slavery was almost exclusively black, and, all I can say about that is, slavery is an ugly mindset that backs one into a corner of one's mind, where one is "forced" to hate because not doing so would be illogical.
I don't like this leftie business of making everything racial and hurling racial accusations ("playing the race card'). It cheapens real racism. Real racism is ugly, it's not equivalent to some politician cutting social funds or gerrymandering for votes