Some parts seem to be borderline. States have infant mortality rates on par with Thailand, Romania and Fiji. Others have life expectancy on par with Brazil, The Lebanon and Sri Lanka. Transparency International rates the corruption index of the USA only slightly higher than Uruguay (no breakdown by state unfortunately, and still quite high overall in developed world to be fair).

Obviously America is a huge place and one size does not fit all, but there are some rural areas that wouldn't seem out of place in a third world country for sure.