The term “third-world” has been replaced with “developing nation.” The US was downgraded to a developing nation by the UN.
The U.S. currently ranks 21st on the United Nations Development Program’s index, which measures fewer factors than the sustainable development index. Good results in average income per person – $64,765 – and an average 13.7 years of schooling situate the United States squarely in the developed world.
The term “third-world” has been replaced with “developing nation.” The US was downgraded to a developing nation by the UN.
https://theconversation.com/us-is-becoming-a-developing-country-on-global-rankings-that-measure-democracy-inequality-190486