The link you provided appears to support my assertion. The vast majority of rural lands in the US have relatively low poverty rates, similar to non-rural poverty rates. A relatively small number of regions with extremely high poverty rates skew the national average, though only by a few percentage points, and in large parts of the US the poverty rates are effectively the same across rural and non-rural populations. Most of the rural US is not Appalachia. Maybe not wealthy but definitely middle class.

As noted at your link, many of the extremely poor rural areas skewing the averages are Native American reservations. How do you propose to make them relocate to cities?