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I love this series! They are great, easy-to-read, fact based biographies that my children have grown up with. Sacagawea was our first book because of my daughter's obsession and from there we moved to other strong historical women, such as Helen Keller and Amelia Earhart. Then we would find subjects to correspond with whatever my kids were studying at school. Really, really recommend this series!!!
You really can't go wrong with this book series. We probably bought around 30 of them. Books are engaging with text appropriate for 3rd to 6th grade and a generous sprinkling of pictures. Walking away from reading one of these books, your youngster will pretty much know all they need to know about the subject to be culturally literate.