It's come full circle. The original expression, back when it was also okay to use the word "negro", was PERSON(s) of color. It was pretty much a standard usage among educated middle class, uh,... persons of color... around the turn of the previous century, up into the Depression, if I'm not mistaken. Since "colored" featured prominently on Jim Crow segregationist signs throughout the south, the shift was to Negro during the 30s to 50s and that, in turn, fell out of favor when Black and then African-American came into fashion. Any number of people who were "of color", though, have pointed out as many whites have pointed out... "I'm neither from Africa, nor actually black...". So there's been a gradual movement back to Persons (or People) of Color. I've seen no one promoting the use of "negro" again, however.