I wouldn’t call the US developed. There is development, with the sky scrapers, mega companies and billionaires, but there are also palaces built in South Africa, North Korea and Turkmenistan. North Korea and Turkmenistan have better infrastructure than the US. But I wouldn’t call insane poverty rates, insane inequality, autocracy, oligarchy, insane incarceration rates, corrupt government and legal system, institutionalized racism and still legal slavery any form of modern development.