The findings made me think of rural Tennessee. The population of the state's rural areas is predominately White with lower levels of education and income. County Health Rankings is a website that allows users to compare counties within a state on various health measures. This site in fact shows that the least healthy counties in Tennessee aren't in metropolitan areas with higher diversity rates but are in the state's rural areas.
One county that particularly stands out is Grundy. Grundy was identified in 2015 as the poorest county in the state. It is just one county over from Chattanooga and Hamilton County. Grundy is 96.6 percent Non-Hispanic White, which compares to the state's 74.9 percent. Something of a microcosm of the death rate findings mentioned earlier, Grundy County ranks dead last in health outcomes when compared to other counties in Tennessee. As you can see from the graphic in this post, premature death rates have been increasing in Grundy while those in the state and in the US have decreased.
Interestingly, Grundy County was once home to the Highland Folk School where Dr. Martin Luther King, Jr. received training. His efforts, along with those of his friends and followers, arguably did more to improve the condition of those in need than any before or since. Looking at our rural counties now, one wonders who will advocate for improving the conditions of the folks living there.