The America middle class is becoming much less white. https://www.brookings.edu/blog/social-mobility-memos/2018/02/27/the-middle-class-is-becoming-race-plural-just-like-the-rest-of-america/ … (note: I'd define middle class as 20th-80th percentile, not 20th-60th, but the trends should look similar)
Does this imply there is more cognitive sorting? As-in the best of each race ending up at the top. Or are there just less white people in America.