Yeah, I read that. I wonder if in another 75 years we'll have become as much more enlightened about race as we did from the 1950's to now and look back on some of our present policies and practices with horror and disgust.
Seems unlikely, the first 80% of improvement is the easiest and we've got to be somewhere close to that now, but I could be wrong.
The systems he described were pretty crazy, confusing race (physical characteristics) and ethnicity (culture). On the other hand, you get that everywhere. I don't even know how to describe my ethnicity. "Generic English-speaking" is my best attempt.
Old as it is, it seems quite relevant in our current race-obsessed culture: https://web.stanford.edu/~learnest/les/mongrel.htm