Eurosocialist:

The Human Development Index is calculated using various indicators for quality of life, such as health indicators and access to healthcare services, life expectancy at birth, nutrition levels, education and literacy levels, access to basic needs such as water and sanitation, and so on. It also takes into account GDP per capita in terms of Purchasing Power Parity and percentage of the population living below the poverty line.

The HDI is a socialist-defined bullsh&% socialist measure. Even so, the US is ranked #6. Economic power is a proxy for a nation's geopolitical power so literacy levels, sanitation, etc. are meaningless relative to the strength of a nation's economic engine. Comparing nations with the HDI instead of by economic power is like comparing two basketball teams based on how well their 6th men played instead of by which team scored more points.