Earlier quoted context omitted.
> It’s amazing that 54% of adults in the United States have a literacy below 6th grade level, AFAICT this is a mis-interpretation. IIUC the actual study says "54% of adults in the United States have a literacy IN ENGLISH below 6th grade level". They might be highly literate in some other language but that wasn't tested.
Only 14% of the US is foreign born according to the last census so that’s not enough to make up the difference. The functional literacy statistics are bad no matter how you dice them.
In Canada the adults with low literacy (below high school) is 49%.