It seems they will accept Africans as Jews more easily than those who are non-Africans. One example are a group of Indians (from India) who claim to be from the tribe of Manashe.
We have known the Ethiopian Jews (most now living in Israel) have existed for quite some time now. It is not in doubt that they followed ancient Jewish law and have done so for many centuries.
I don't understand why it is not logical that there are other long lost Jewish traditions throughout that part of the world that could be traced back to the ancient Holy Land.