Or almost all of the former USSR up to this day, excluding a few cities here and there. The place I'm living in basically hasn't changed in the last 30-40 years.
A lot of American urban neighbourhoods are quite impoverished too though. Probably more so than eastern Europe was, for the terrible Soviet architecture was functional, cheap and ugly but not necessarily bad. And eastern Europe didn't have the large divide between rich and poor that the US has.
[1] https://www.youtube.com/watch?v=_P4-4nK4RR0