The book "Glencoe" by...dammit, my copy's in storage. Anyway, it gives a very good, balanced account and it's written by a Scottish historian. (I bought it at -- surprise! -- Glencoe.)

You might also peek here.

(In the fear of causing thread creep, living here, just a few miles south of the Shoshone-Bannock Reservation and having lived for many years in Potawatomie country, I've found that both groups (and others, such as the Navajo, Hopi, Apache) prefer the term "Indian" to "Native American." Best of all, call them by the name of their Nation. As one said, "Don't call me 'Native American.' Anyone born here is a native American. Call me a Potawatomie or an Indian.'")