Apr 12, 2012 · sential content for AP United States History is the heart of the textbook. The selection of this content is based on the review of past AP exams, the topic and content outlines suggested by the Advanced Placement U.S. History De-velopment Committee, and the authors’ experience teaching U.S. history on the AP and college levels. • The Islamic world undertook a massive translation project in the ninth and tenth centuries that made many Greek texts available in Arabic. This contributed to a flowering of Arab scholarship, especially in the sciences and natural philosophy, between roughly 800 and 1200 c.e.