You're right: race and class are big issues that affect education, but outside of that sentence, you only talk about financial (and therefore class) issues. There are plenty of facts in what you wrote, but none of them are about race.

I take no issue with the way you worded it (though I'm sure some people would, so I wouldn't use that phrasing on my company's blog). I take issue with the lack of evidence on that particular point. It happens. The rest of it was good, and your cause is admirable.