Negros are descendants of Cham son of Noach.
"Cham" means hot.
Cham was so named because in the ideal, Chamites were meant to be hot and excited in their service of Hashem.
As we can see from their gospel church singing antics, the Negro has excitable talents, and he can really believe with a passion.
If that hot passion can be harnessed for Avodas Hashem, all for the good.
Unfortunately Negro history has shown that their hot passion usually only goes towards their own and the world's detriment.
Most Chamites will not exist in the Messianic Age, as brought in the Midrash from Zecharya 13 and quoted by the 3rd Lubavitcher Rebbe, the Tzemach Tzedek.