Yes, they were. Not slavery, but denied those benefits that minorities are denied today. Dismissed and trapped in areas with no education, no job prospects and no way to get out of the situation. Visit a small coal mining town and take a look around, those people do not have the ability to make enough money to move, access to any education to speak of or any of the standard opportunities that people in major cities get access to, even minorities.
That you do not seem to even be able to fathom this is no different than a white person making the same claim about minorities. I lived in one of these communities once and I have never seen anyone of color face even close to the same level of depravity. mostly because I never lived in places like south central LA where that kind of depravity exists within communities of color.
Statistically, blacks face more of this than whites. However, it is asinine to assume such problems do not exist within poor white communities as well and, by sheer numbers, there are even more of them.