The states that do lag significantly (MS+WV) are comparable to Portugal/Poland/Greece on developmental metrics, but they only represent ~1% of the entire American population and are anomalies due to historical social economic factors (that said, this should not mean that we should give up on them - we should in fact double down and invest in upgrading social infrastructure in laggard states).
That said, every single American state and territory fall strictly in the "Very Highly Developed" category from a development standpoint and calling them "3rd world" is only minimizing the actual suffering that exists in less developed countries as well as orientalizing actual poverty upliftment in former "3rd world regions" like China, India, Turkey, Mexico, ASEAN, the Warsaw Bloc, the Balkans, Southern Europe, South America, South Korea, Taiwan, etc.
US State HDIs - https://en.m.wikipedia.org/wiki/List_of_U.S._states_and_terr...
European HDIs - https://en.m.wikipedia.org/wiki/List_of_sovereign_states_in_...