You are showing ignorance here by misusing the term species. I'm not trying to be a dick, but you really aren't informed enough to say that kind of thing.
Species is defined as organisms that can breed and produce fertile offspring. Black people, white people, yellow people, etc., are all capable of producing fertile offspring. Therefore, the human race is one species.
What you are really referring to is subspecies. And yes, those do exist in the human race. But as the physical barriers between populations become reduced, these will eventually merge into one.
There are definitely genetic differences between the races, but it does not create different species. Also, the definition of race has changed a lot over time, which shows that it is more of a relative thing than anything else. Italian people are considered "white" nowadays in America, but if you tried telling that to my great-grandpa, he'd think you were nuts. Race is pretty artificial when you really think about it.