Here's another clue ...
Unemployment rose for ALL races .... and poverty has risen for ALL ethnicities, too!! Over 7 million jobs were lost while GeeDubya Bush was the president. A disproportionate percentage of those had been Black employees.
White people are being re-hired at a faster rate than Black people .... but there technically has been a NET GAIN, overall, of jobs since President Obama was elected ... not a net LOSS.
Mayors can control what businesses come in or go out of a city. In some states, they have some measure of control over the school boards and their funding. They have the ability to create job training services, work with city colleges and establish a variety of job-creation measures. They can also create local government jobs and services ... but most just simply don't have the budget for it.
Black people can find a myriad of ways to help other Black people. This is especially true for Black politicians. Unfortunately, job corruption usually gets in the way of that, though.