Been there, read that.
Very interesting book. Written by someone interested in what actually happened in the Americas before whitey showed up, not just in the history of the oppression of the native Americans by the white man.
An awful lot of the PC “histories” of the Indians portray him not as fully human, but almost as a type of wildlife.
http://www.amazon.com/War-Before-Civilization-Peaceful-Savage/dp/0195119126