From the telegraph and cotton gin to the World Wide Web and Microsoft, learn all about the inventions that shaped this history of America. A must-have for social studies curriculum, this educational pack of historical documents contains a mix of primary sources, like illustrations, patent drawings, advertisements and more. Instead of just reading about these industrial achievements in a textbook, students will have a chance to interpret and evaluate information for themselves, allowing them the chance to think critically and analytically. Cardstock. (20 pcs. per unit) 8 1/2" x 11"