It's not race. It's school system. I was reading the difference between public school books, and private school books the other day because G. Maxwell's father was in charge of McGraw-Hill. Then there is home homeschool books. Home school book brands can be private school good, and Wikipedia bad.

An example that would depend on your age. Did you have your own worksheet workbooks you ripped the page out to turn in, or did you always only ever get xerox copies? If you are old enough that you had workbooks your handwriting tattles on where you grew up. The school district bought the brands they chose.