This is, to the best of our knowledge, the world's first open content US History Textbook. This textbook is based initially on the College Entrance Examination Board test in Advanced Placement United States History. This seems to be the best reference on which to build a textbook, since it is a standard on the subject and covers what most U.S. history students study in high school and college. Overall, however, the content and structure may in time vary from all other books. Besides the regular wikibook rules governing unbiased writing, the only other guideline should be that everything...