I'm surprised you didn't mention Detroit. I've been through some of the worst neighborhoods. I couldn't believe I was in the US
I have some good memories of Detroit. In the early 60's after the death of my dad my mother bought a house on the east side, about 1 1/2 miles south of 8 mile road. I remember the smell of leaves burning as I walked home from school with my best friend who was black. The family that moved in next to us, a black baptist family that took me to church with them.
The area had been heavily polish/catholic, now "the blacks" were moving in. Rumors of a pending race war were heard of often. White flight began. We moved a few hundred miles north to a truly shit hole hick, red neck town of in breeders. The whites left Detroit and the jobs followed, the tax base shrunk. Public services were underfunded, schools often times didn't have paper... either to write on or wipe your ass with.
The police department was mostly white and targeted the blacks. The riots broke out in '67, a self fulfilled prophesy caused by the actions of those who predicted it.
Today Detroit has 3/4 of a million people. In 1950 it had 1.8 million.
Shit holes are in the eye of the beholder, fear, repression and flight cause them. Today, I have high hopes for Detroit. Instead of just building another monument and proclaiming a renascence in the city, the current leaders are making the neighborhoods inhabitable again. Street lights, garbage pick up and plow the streets after a snow fall are things that only the elite saw for years.
Tearing down old houses, cleaning lots that were made dump sites by those in the suburbs and dealing with slumlords is a every day event now.
Jobs are returning, things are getting better, shit holes can be fixed.