Lowell, Massachusetts, stands apart as an exceptional city. Bursting onto the scene in the 1820s, Lowell quickly became the workshop of America, powered by the mighty Merrimack River and staffed by tens of thousands of immigrants. Even as the mill era faded, people from around the world kept coming to live and work in Lowell. In the 1970s, community leaders imagined a new Lowell built on its legendary past and echoing its early innovation, a renewed...