Grew up in Southern MI so there were a few within a 3-4 hour drive. It's been 20-30 years since I've been to them so don't know if they've changed for better or worse. Detroit, Flint, Muskegon, Benton Harbor, Gary IN, South side of Chicago all had areas that qualified as [bleep]. Brooklyn NY and St Louis MO would also qualify. I've been to some very poor areas of southeast US and villages of Alaska but looked at those places as circumstances of location economics and not really as once well off now decaying [bleep].
The slums outside of Caracas Venezuela were pretty bad, but the worst was the slums outside of Capetown South Africa.
