Access to (and belief in the possibility of gaining access to) resources seems like the greatest predictor and greatest stumbling block for all demographics that are historically "underprivileged".
Prejudice, racism and discrimination are not necessarily the leading factors in determining a group's economic success or failure except where these factors directly determine a group's access to resources like education, transportation, and even grocery stores.
Part of the problem we are looking at here is how the basic issues get ignored, while political band-aids are applied in attempts to provide a balm as a big fix.
It's a case of treating the symptoms and not the cause.
There are too many bright and active people in our world for me to imagine that in 20 years things will be worse along demographic lines. I have to think that sooner than later, we will recognize that communities without grocery stores - and where few people own cars - need to change logistically so that people aren't shopping at corner stores for food, overpaying, and essentially being stuck in a situation where there is no potential for moving up. This, of course, is just one example of how poverty becomes systemic and perpetual. It is a practical problem, born, perhaps, from racism, but now culturally entrenched.