TN, specifically Nashville, has benefited from an influx of money out of the NE US. I'm a little surprised about Chattanooga however it does have the VW plant along with all the support industries which has been a success economically.
Fun fact. It is estimated that nationally the housing shortage is about 700,000 units/yr. This one reason why there won't be a crash like 2008. The other reason is that borrowers have fewer avenues to commit fraud. Yep, I'm going to say it. 2008 crash was mostly due to borrowers committing some level of fraud.
I don't know if I'd call it fraud, but a lot of people were really buying more than they could and should afford. And banks were more than eager to give it out. I remember people I worked with at Target (making less than $10 an hour then) getting a mortgage on a $200,000 house. Completely insane.
They're still pretty crazy. Of course I'd be ahead if I did it, but by myself when I bought the swamp shack, I was approved for $140,000 by myself. Single income. Right now, my fiance and I are looking for a new house and the one we have an offer in on now is only 1.5 what we make a year with our max being twice what we make a year. The mortgage on this one will be 1.3 paychecks a month for me , or exactly 1/4 of our take home pay each month. I know a lot of people who aren't doing that.