Earlier quoted context omitted.
Detroit was the hub of the auto industry. Outsourcing and foreign competition hollowed out the central city (which deliberately didn't have public transit) and left gigantic abandoned houses and skyscrapers throughout. There has been massive public investment and popular support to cause a revival of sorts in the city and is a success story. Go look at some photos from like 2010-2014.
How was the work outsourced around that timeframe? Do they no longer have an auto-industry at all in Detroit, or is it just greatly reduced?
People often point to foreign competition for the downfall of urban Detroit but the writing was on the wall and decay starting well before foreign imports made a big splash. Between 1945 and 1957, GM, Ford, and Chrysler built 25 brand-new auto plants in the Detroit metro area. Not a single one was built inside the city limits. They weren't building these factories overseas (yet), they were building them in cheaper parts of the US. Detroit lost hundreds of thousands of well-paying factory jobs well before Volkswagen and Toyota started selling things in real numbers in the 1960s.