North Miami, Florida
North Miami (different from North Miami Beach), has a population of 63k people with 23% living below the poverty line. Naturally, this city faces issues with flooding and infrastructure failures. Infrastructure issues do nothing but aid in the failure of a city, and North Miami struggles heavily with that fact.
The city also sits on top of a huge human biowaste disaster. There are 2,780 septic tanks in the city that will fail and spill wastewater in yards if it's not fixed. So far, nothing has improved in terms of septic tank infrastructure.