i Think: U.S. History Activity Book Set of 13This set of 13 books features a variety of engaging, student centered activities and lesson plans that examine U. S. History. These units consist of complete and easy to use lesson plans along with study guides and differentiated tests. Like all InspirEd materials, they incorporate critical and creative thinking, test taking skills, reading and writing in the content area, and much more! Set includes one of each of the following books: i Think: U. S.