You white people are sooooooo funny. You have NO clue.
But don't fret. Ariell is here to set the record straight.
Caucasians are white. African Americans are black. Indians are red. Asians are yellow. Mexicans are brown. Although the latter three aren't referred to as such on a regular basis as whites and blacks are. Perhaps there's a reason for that. There's this thing called a race spectrum scale. Whites are clearly at the top while blacks are way way down at the bottom. Everyone else just falls in between.
No one outside the African or Aboriginal race is considered to be black. As someone mentioned earlier, there's a one drop blood rule that applies to blacks. It goes back to slavery. Even if only your great, great, great, great, great grandmother was black, you're still considered to be black. But if one of a "white" person's grandparents was indian, they're almost always considered white. Does Walker, The Texas Ranger ring a bell? So that's what determines if you're black or not, your ancestory, and not this cultural nonsense you guys have been babbling about.