Earlier quoted context omitted.
What makes this area so good for manufacturing? (I've never been and I'm curious)
There's no environmental protections or regulations of any meaningful kind, property is almost free, and there's a significant labor force of people willing to work for minimum wages. It's not great for manufacturing. But it's not the worst place to do so.
So it's either "have no money and get poisoned by lead in the water pipes" or "have money and get poisoned by the pollution of the factories?"