[Jedi Master Pikachu]

The concept of there being races of humans (in the modern sense of race) is a socio-cultural construct, not strongly based upon science or genetics. Americans can be simply Americans. Some can be of a dark complexion with a tight, curly 'fro; some can be of a pale complexion with round eyes; some can have slanted eyes, etc. There CAN be one American race (using the old sense of race as nationality or ethnicity (grouping people based on a common culture)).

[Clemenza]

Re: 12 you are absolutely correct. Just as there can be an AMERICAN Civilization (Teddy Roosevelt thought that there was).

[CheyennePress]

The concept of there being races of humans (in the modern sense of race) is a socio-cultural construct, not strongly based upon science or genetics.

I'm sorry, but this is simply incorrect.

There are very real and distinct genetic differences between the races that extend the spectrum of human variability, from skin color to hormone sensitivity to susceptibility to various toxins to predisposition to genetic diseases.

There are absolutely acientific and genetic difference between the races.