OK, here's a somewhat more pertinent quibble.
Now, I'm a Bit Twiddler by trade, no ethnologist or anthropologist, but I don't think the phrase "the Anasazi tribe" is correct. The term usually used is "Anasazi *peoples*". I'm not sure just what the technical distinction is, but as I understand it, "the Anasazi" are a pretty mysterious bunch, just a term for whoever the heck it was who lived in that area and left those artifacts. To call them a "tribe" attributes more structure and detail to thier society/societies than we know.
Unless you meant "any bunch of Indians is a tribe", which I'm sure you didn't.

- rob