Go visit Rocky Mount, North Carolina.
Go visit Danville, Virginia.
Go visit Tuscaloosa, Alabama.
Go visit Harrison, Arkansas.
Go visit Atlanta, Georgia. *
There are hundreds of towns that have lost all the industrial and agricultural jobs they once had, and the people have sunk into deep poverty. Many of these areas now face an epidemic of meth, which seems to be how people in these regions deal with the hopelessness they feel, now that the jobs are gone.
*I mention, Atlanta, which is a large region. There are, of course, many areas of Atlanta that are gentrifying, but if you travel around the city at all, you also find huge neighborhoods that have sunk deeper into desperation. I am old enough that I can remember how affluent Atlanta was in the 90s, and I can remember how crime-ridden New York City used to be. The reversal of fortune is really remarkable. Nowadays I feel safe on New York subways, even late at night, whereas I no longer feel safe on Atlanta rail lines, even during the day (depending on the line).