The Americans who can't read
The US has more citizens who are illiterate - some 16 million people - than many of its developed counterparts. Why is that?
Many complain that the system fails those who need extra help and there is a big disparity between rich and poor areas.
Being illiterate prevents people from getting jobs. But it is not only that.
Peggy Fleming, who lives in Kentucky, one of the worst-performing states, said she wanted to set an example for her children by being able to read and write. "I wanted to be a better mum," she says.
Aleem Maqbool reports for the BBC's America First? series.
Video by Franz Strasser; produced by Ashley Semler