Sixchan says,
While that's what the North American model is based on, race here is less based on 19th century science (which seems to be the structure you're talking about) and more on a kind of incipient caste system which has grown up, in different forms, all over the continent. Race, in North American discourse, falls somewhere between the construct you're talking about and the ethnic construction others seem to be talking about. I'm also a little lost as to where South Asian (Indian, Pakistani, Sri Lankan) people fit into your model. In North America, the fact that such people are non-White completely trumps the fact that they are Aryan/Caucasian. Blackness in the Americas is a horrendously complex, problematic and contested concept; in North America, it extends considerably beyond the "negroid" physical type whereas in Latin America, it is a subset of this physical/racial type.
Anyway, academic BS aside, to most North Americans, there exist the following races: Asian (East Asian people), Indian (South Asian people), Black (*), Hispanic (Mixed race people from Latin America and NOT people from Spain who are, of course, White), White (*) and Amerindian (unmixed indigenous people from anywhere in the Americas and mixed-race indigenous people from north of the Rio Grande). While physical features and lineal/genetic descent are major factors in category formation, they are not the whole story but I won't even begin attempting to define the other factors here.
PS. Great sig by the way. My mantra when entering a difficult social situation is often "I am number twelve. I am left-handed. Flapjacks are my favourite food."