There is no historical precedent for the claims of the black hebrews (that the children of israil were black). Black people descend from Nubian Kush south of Egypt through Kush son of Ham son of Noah. This can be witnessed by the egyptian hieroglyphs some of which have pictures of a Nubian princess being married in Egypt. Egyptians are clearly distinguished from Nubians (check out Nefertitti's head sculpture. She had narrow features and was clearly not brown, unlike the people of Nubia from many paintings and sculptures. The Egyptians were bronze people not brown. The verses in revelations depicting Jesus as having wooly white hair and bronze (not brown) complexion are not a valid evidence because there are other people besides Nubians that have nappy hair (check out the people of Bahrayn (andother arabs too) not to mention that Solomon was mentioned as white and ruddy in song of solomon. To learn real ancient history refer to Josephus, Menethos (egyptian), Heredotus, Strabo, Pliny the Elder, Eusibius of Cesarea, ibn Khaldun, ibn Jarir al Tabari, ancient paintings and sculptures from Egypt, Mesopatamia and countless other nations etc. and of course the Bible itself.
Where do you get this idea that the children of Israel Nubians?
Its contrary to all historical knolwledge and has no precedent. History is based off of written reports, archaology, corraborative reports from other nations and the refined human intellect (for comprehension of the data).
If you reject ancient historical knowledge you are emptyheaded and could believe anything as long as it suits your desires. You need to learn real history and stay away from false prophets who appeal to your racial bias. Be objective from the start.
(note, im not a darwinist and fully believe on the strength of the Quran and Bible that all the tribes came from Adam and Eve and then through Noah and his sons.)
Bible history and its 6,000 year human history is a solid foundation (six thousand year days of creation and the 6,000 years of human history.