Problems of poor people of all races is exactly where structural racism is! The reason it can go unnoticed is due to that structural racism - and yes ALL poor people suffer from it! In many cases, all people suffer from it but poor people more than most (or at least first).

Water quality and environmental hazards of all kinds hurt poor people the most but racism is often the reason why many people feel they can ignore it. Another is something McWhorter mentioned but didn't go far enough (IMO). He mentioned that many schools have decided not to do suspensions and this primarily hurts African Americans because many schools that are African American (read: urban) have 99-100% black and brown students.

So much of the resources that are important for students learning - such as no lead or pathogens in tap water - are in neighborhoods of poverty. We could fix this problem by making it everyone's problem by integrating neighborhoods. While neighborhoods are segregated by income, racism is often what keeps them from being integrated.

The reason you can't find it is for this reason: Black and brown people are more often poor AND lumped in with other poor whites but racism is the glue that holds this particular status quo together.

The big problem is that a lot of what is primarily affecting poor areas and POC today can be ignored by those in power to their own detriment. Climate change and poor quality drinking water are not staying in one place.