I agree with you Salah 100%.
The original people of arabia and east africa were mixing, inter-marrying for thousands of years(they were seperated only by a small sea). All you have to do is look at the Arabs,Ethiopians, Somalis, Kenyans, Sudanese, Egyptians, etc. and you will see similarities in at least 25 to 50% of the populations. The shemites and the hamites were the brown and black races, they became lighter skined in Arabia only after the ancient civilizations of Axum, Meroe, Egypt, and southern Arabia were Conqured by the Greeks and Romans(Japeth).
Assalam alaykum!