Rural areas in the US are heavily subsidized by urban areas (which is not inherently bad, but the perception that money flows the other way is a big political problem), especially when it comes to social services such as healthcare, disability payments, welfare, etc., but also if you just look at basic infrastructure like roads, sometimes disguised as regulatory requirements that private infrastructure providers maintain some baseline service everywhere. The issue is that providing high levels of service to sparsely populated places is very expensive. Of course many states are also doing a poor job of basic infrastructure maintenance statewide, but that's a different problem.