In ancient Israel there were many ethnic groups, but race is never mentioned in the Jewish Bible. There is plenty in the Torah about skin diseases and ways to keep clean but there is nothing in the Torah that describes the color of people’s skin in a pejorative way. 2,000 years ago the nation of Israel traded with people to the south, people to the north, and people to the east. Jerusalem was at the crossroads of the world. The population of Jerusalem was black and white and many shades in between. Jerusalem was cosmopolitan.
Race is a concept that was introduced by European Christians long after the Bible was completed. The concept that the “white” race is superior to other races benefited European Christians. I am not sure of this, I need to do more research, but I think the idea that black skin is inferior to white skin may have been invented to justify colonialization and exploitation of Africa. It made slavery possible and justified its existence.
European Christians had a number of interesting attitudes toward Jews. They saw Jews as “other” and regarded Jews as black. At the same time Jesus was depicted as white. I have always laughed at the pictures of Jesus that show him as a Scandinavian with blonde hair and blue eyes. It is more likely that the actual person named Jesus had black skin.
It is conceivable that after the destruction of the Temple in 70 A.D. the Jewish diaspora spread to Africa as well as Europe. Because everything that we have learned about Africa comes from European Christians, we think of Jews as “white” like European Christians. It seems perfectly reasonable to me that black skinned Jews settled in Africa. I can understand why it’s inconceivable to racists.