Nobel prizes? Manned moon landings? Reserve currencies? AC units per capita?
There's also proportion of adult in prisons, people who believe in angels, and the mass-shooting high score
> AC units per capita
This gave me a laugh
People migrate for economic opportunity. South Africa is not a rich country, but sees millions come in from the SADC for this reason, despite some pretty big social problems.
The US is nothing special, it's just a particularly large market of economic opportunity with a history of allowing in migrants. If China was significantly more migrant friendly, we'd see the same happen there. None of this specifies that the US has some secret recipe for success that papers over some of its obvious and glaring deficits.