Replace black, and America, with African refugees, and Italy, or whatever. Just because it uses this particular instance as the example, does not mean that it doesn’t apply to systems of power everywhere. This is specifically how it went down in the US. However this template of behavior can be seen everywhere. If you read the whole thing you will find that it is discussing how a society’s majority, that is in control (a population minority can be the ones for whom the system is built, so it is those in the majority of positions of power, that matter), builds its structures, and, consciously or not, this negatively impacts minorities within their borders, as it selects a preferential treatment of the majority demographic of it’s power structure.