For more than a century, the Conshohocken steel mill in suburban Philadelphia employed thousands of people and anchored a booming industrial economy. But the original owner went bankrupt in the 1970s, after which the facility limped on with a succession of new owners. Last summer it was idled indefinitely, and put up for sale.

It’s a familiar story of decline. The Trump administration talked a big game about reviving American manufacturing; its efforts so far have been a failure. But in Conshohocken at least, the remnants of America’s industrial age are a perfect fit for what’s powering its economy now — artificial intelligence. A local developer quickly moved to convert the old steel mill into a massive new data center.

“What I’m proposing is to enable AI to progress while replacing 19t

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