Is the US one nation or a group of three (or more)?
I was struck by this table of Human Development Index values for different groups in the US. It looks like three different countries when broken out this way! There is one group clustered at 7.5 (Asians), another around 5.5 (Whites) and another around 3.5 to 4 (Blacks, Hispanics, Native Americans).
The indices are computed by this project, using US government data. See here for more, including a nice visualization with results by state, district, etc. Can the life expectancy of Native American and Latino women really be higher than for White women? Latino males also seem to have longer life expectancy than White males.
More on life expectancies of different regional and ethnic groups in the US here. (The researchers define 8 different Americas by race and geography or class.)