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Why was Portland, Maine remained and still remains a small city in New England in comparison to Boston or New York?
Portland wasn't really always like this. Back then, it was an important industrial center fueled by a profitable port, the city grew in economic output and population through the mid nineteenth century. Portland was a city that actually even rivaled New York and Boston until after the Civil War. So what sort of prevented Portland that would've ever become that a one day large American metropolis. Geography? Politics? Natural disasters?