Its just a coincidence.
These cities collapsed because of "white flight" aka racist white working class folks didn't want their children to be raped, maimed and robbed at school-- didn't want to pay higher taxes so they could fund ineffective, fat, black women named "LaWanda" (with a masters degree in something for some reason) to teach their kids about important things like: "shit about social sutdies", and didn't want to deal with the crime, stupidity and general ugliness of the inner city.
Obama's plan to fix this racism is simple-- tax everyone into oblivion on the federal level.
Also, its in the name of "fairness".