This is, as far as I can tell from an outsider's perspective, not relevant in modern America. There are powerful people of all races and both (real) genders in America. But that's not enough, of course, now it's just a game of percentages for them.
I think the black community needs to get off its high horse and understand that they are a minority, and as such the country they live in will naturally reflect their culture less than the majority's culture, which is perfectly natural and acceptable. That's not what oppression is.
Its not an issue of which culture is most dominant. The black community is still dealing with systemic issues which make living let alone thriving in modern America difficult if not impossible. Are there special people talented or lucky enough to overcome those things? Yes. But the vast majority don't even get the chance to try. Many are born into poverty stricken neighborhoods, they are given limited access to modern education, and even less of any significant quality, they are targeted by law enforcement for harassment, and if arrested are more likely to be convicted for minor crimes, and more likely to be given harsher sentences if convicted. Worse, most of these issues are exacerbated by local and state governments which make it difficult for black voters to be proportionally represented, and in some cases prevent black people from voting outright. So, compared to a 'normal' (i.e. White) experience in the US, a black person on average starts off poorer, gets a worse education, gets more targeted by the police, faces harsher consequences as a result of that targeting, and if they get past all that, they still find it harder to find a high paying job, harder to find a high quality place to live, harder to get represented by their local and state governments, and they still get to deal with police harassment and social discrimination for the rest of their lives.
That's just the stuff I know about as someone who is not black and has only listened to what black people have told me. I'm sure there are more systemic issues of which I am unaware. Black people know about all this stuff, they see who is ensuring that it continues to happen, and they are pissed about it.
What's more, black people are still living with the economic consequences of segregation. For example, I was lucky enough that my grandparents had enough money during their lifetimes that they were able to put aside money to help me through college decades later. The grandparents of most black college students don't have those resources because their grandparents were stuck living in a society where they were effectively unable to get ahead let alone put aside money for their descendants (for an education which, at the time, black people could only get at black colleges, and no universities). While many (though not all) of those institutional and financial barriers have been dismantled, I still had an advantage going into college compared to my black peers because of the economic status of my grandparents. Just because we've had a black President, and universities now accept black people, does not mean that the damage inflicted on the black community over multiple generations has been fixed. The consequences of that history is still very much present and relevant in the current generation.
