Living in the U.S. we can easily lose sight of the fact that before Europeans and other immigrants came to the U.S., the country was populated by American Indians. This book is a good introduction to the various major Indian tribes in the U.S. It's good for 2nd or 3rd grade, possibly 4th grade, although the actual pronunciation of the tribes might be difficult for some kids.
The book has nice, soft, detailed illustrations on each page, and a short summary on each tribe. The actual description of each tribe might be only 75 words, but between the description and the detailed illustrations, children will form a well-rounded undestanding of those who lived in America for centuries before most of their/our ancestors arrived here. This is a vital chunk of history to inculcate in the mind/psyche of a child.