By many metrics (life expectancy, inequality, literacy, poverty rates) the US is a third world country.
Child mortality is closer to Africa than Europe.
Again, about children, US has the second poorest children among the 35 most developed countries in the world.
More than half Americans have their literacy prophiciency below elementary level.
There's almost a million homeless people in US, that's more than in several rich countries like Japan, Italy, Poland, Germany, etc, combined. Hell I've never seen bidonvilles and tents all around cities in Europe or most of Asia like I've seen in LA or SF.
Inequality in US is at south America level.
US has more incarcerated population than all developed countries combined.
I did study at Ohio State for a semester and visited US multiple times tho.
Edit: Also third-world country mean something else completely since Turkey is first-world by original definition.
Also, social mobility is preferable to inequality. Inequality is terrible on many levels.
Everyone is poor – low inequality (1)
Everyone is middle class – low inequality (2)
Many poor, few rich – high inequality (3)
Theoretical cases, not observed in the real world:
Few poor, many rich – high inequality (4)
Everyone is rich – low inequality (5)
The metric of "inequality" only scores well with either poverty (1) or average outcomes (2) in the real world. Is that socialism or communism? I forget.