Based on the adult nonfiction book 1491: New Revelations of the Americas Before Columbus, Charles Mann does his best to make us question everything we think we know about Native American culture before 1492.
Just over 100 pages - Before Columbus: The Americas of 1491 contains beautiful art, but is not your typical picture book. Target age is definitely ten and up, with several paragraphs of rich, full text on most pages. Mann does not gloss over the details, but instead tackles eleven chapters' worth of information - covering everything from the Asian footbridge to genetic engineering (of corn) to mummies and tapeworms.
For middle grades to adult, this is an excellent book to add to your studies of American History, especially for the textbook-phobic.