How did we get here? A big part of the story - although not the whole story, experts agree - is deindustrialization. With its prominence as America's founding city, its central port location and proximity to coal and other early resources, the great Industrial Revolution of the 19th and 20th centuries came to Philadelphia early . . . and left Philadelphia early. A huge source of employment in neighborhoods such as Kensington was the textile industry, which started moving to the cheaper labor in the American South and was decimated in the Great Depression of the 1930s. Other factories - Philadelphia was once nicknamed "The World's Workshop" because of its toolmaking - boarded up in the mid-20th century, although the impact was blunted for a time by massive military spending, especially at the Navy Yard in South Philly.