Answer: leftwing rule since 1961. Havana was one of the most affluent cities in the world when Castro took control and Detroit was one of the most affluent cities in America when Democrats took control. Now the two cities look alike – that’s Havana above and Detroit below.
Leftist ideology breeds regression. But they can’t tell you this is going to happen. So they call their ideology “progression” and then spend their time disseminating propaganda against the Right. While you’re focused on THAT, the Left is letting your cities fall to complete shit, like backwater third-world countries.