ALL humans are the SAME race according to the dictionary since they are...

[Jeremy]

...persons and share common descent? race

–noun

1.
a group of persons related by common descent or heredity.

2.
a population so related.

3.
Anthropology.
a.
any of the traditional divisions of humankind, the commonest being the Caucasian, Mongoloid, and *****, characterized by supposedly distinctive and universal physical characteristics: no longer in technical use.
b.
an arbitrary classification of modern humans, sometimes, esp. formerly, based on any or a combination of various physical characteristics, as skin color, facial form, or eye shape, and now frequently based on such genetic markers as blood groups.
c.
a human population partially isolated reproductively from other populations, whose members share a greater degree of physical and genetic similarity with one another than with other humans.

http://dictionary.reference.com/browse/race ( Merriam Webster Unabridged )

 

[Militant Black]

If you choose to believe that race is a social invention, you can, but it's not.

 

[drummer boy]

That is because of The "Adam and Eve theory." Also, scientist have found a common ancestor that evolved into homo-sapiens found in Africa, and was believed that either they evolved in Africa or traveled from Africa and evolved into different races in different parts of the world. (Ice made bridges for people to cross into australia and North America). I think this is why it says that.