Reading number 2...Educational Demographics: What teachers should know

I found this reading interesting because as I said before moving from an other country I don't know the most common information about schools, teachers and students in the U.S. so it's important for my and I think it's a blessing to take this class that shows me what's going on in schools today.I had a few questions about the reading as "Hispanic is not a race" I was a little confused about this situation and I want to know why Hispanic is not considered a race and I didn't find quite clear when it was talking about the miscegenation marriages because before the reading was noticing that 40 percent of all Americans have had some racial mixing in the last three generation but then it says that Europeans Americans are married to a spouse from the same country of origin and pretty soon Hispanics and Asians will do the same but Diversity in increasing. So my question is "is diversity incring now but soon will decrease or what?".
I loved the few tips for teachers at the end of the page and the sentence "Rather than "color blind" your goal should be "culture fair" is a pretty strong and important sentence that every teacher should look up to.