This book series is an educational blend of information presented in an entertaining manner. Changing font styles and sizes helps to maintain the attention level of the reader as the eye is challenged to re-focus from line to line, paragraph to paragraph, illustration to illustration. The books in this series don't get progressively more difficult, just progressively more interesting. Patriotism 201 is just an extension of Patriotism 101. 301 is an extension of 201 and so on. The books can be used by fourth grade level readers; great for sixth grade through junior high as well as excellent supplemental reading for the high schoolers. Even older folks can appreciate 're-schooling', getting a refresher course on things that were learned some time ago, but have been forgotten over time. And believe it or not, you just might learn something you never learned before. Each page is a work of art. Easy to read - Fun to read.