How many races of people are there?

there are not that many, there are Caucasian, Asian and African, these 3 races spread into different directions across the world, hence we have so many people of different "colour" eg; the people in the Mediterranean are almost like an olive shade, Asian are more light beige Caucasian can go from pasty white to brownish, African can go from deepest ebony to light brown, then when people have children they can go either "colour" we all have the same "colour" blood bright red!! that is what makes us all human and brothers and sisters under the skin.