I have never worked in a manufacturing plant or industrial sit with many buildings. But maybe one day after college. Yourslef?
No I never have but I have heard bad things, what do you think?
Where I live in Syracuse , New York it has been proliferated since the 1870's. It seems to be bad, but still going 
Oh that is interesting, I wonder how they have been able to do it?
During like the 1900s, about 87 large industries were scattered in Syracuse.
Are there any other cluster of industries in the states?
Cluster munition
A cluster munition is a form of air-dropped or ground-launched explosive weapon that releases or ejects smaller submunitions. Commonly, this is a cluster bomb that ejects explosive bomblets that are designed to kill personnel and destroy vehicles. Other cluster munitions are designed to destroy runways or electric power transmission lines, disperse chemical or biological weapons, or to scatter land mines. Some submunition-based weapons can disperse non-munitions, such as leaflets.
Because cluster bombs release many small bomblets over a wide area
, stating "There was all sorts of talk about it. We read scripts and I think it's now not happening, I haven't heard anything. I think it's just difficult to get everybody together. Everybody is doing such different things. Maybe they think everybody has moved on, I don't know. You never say never but I have not heard anything of it of late".
Iwan Rheon later commented: "It looked like it was really going to happen at one stage, but it's