I'm not blaming the whites, I'm sure their are wealthy ethnicities across the globe profiting from our hybrid form of oppressive capitalism and socialism...
Ok so Ill give you a synopsis of the way the hood has been built with regards to blacks and real estate.
Sometime shortly after WW2 African Americans(mainly in the north and large cities) began to have more opportunities to relocate to slightly better neighborhoods . Well it became common practice to sell African Americans homes in predominately white neighborhoods for higher than market prices. Well after a few black families moved into the neighborhood, it would cause home prices to drop(because in the 50's-60's many white people did not want to live near black people) this would cause the white families to quickly sell their property(to black people, because you can charge them more) and move, dramatically lowering home prices. Now many of the black people in the neighborhood are upside down on their mortgages, and eventually these neighborhoods became the same minority neighborhoods the original black buyers moved away from. There was really no viable escape from impoverished areas for African Americans, and it's sad to say that these real estate practices and how home prices are effected by % of black people still exist today.
Combine this with public schools being funded by local property tax, and you have your perpetual cycle of "hoods".
Your poor whites do exist in urban areas but are highly outnumbered, by minorities. I am a pure example. When my mother left my father, she moved us to a very cheap apartment community in one of the largest cities in FL. I was one of 3 white kids in my class out of 35-40 kids. I am sure it is the same ratios in Detroit, as it was in other large cities that I have been to. When black people once again only make up only 14%, how else can you explain those ratios?