According to the US government there are 5 main races:
American Indian or Alaskan Indian
Black or African American
Native Hawaiian or Other Pacific Islander
and 2 main ethnicities:
The ethnicity question should always be asked first, then the race question.
(I work in public health, and have to deal with this stuff ALL the time.)
"I don't know! I don't know why I did it, I don't know why I enjoyed it, and I don't know why I'll do it again!" -BART SIMPSON