The Gilder Lehrman Institute’s AP U.S. History Study Guide is a free, comprehensive resource designed to help students strengthen both their historical knowledge and APUSH exam skills. Organized around the nine AP U.S. History time periods, the site brings together primary sources, scholarly essays, videos, practice multiple-choice questions, and test-taking strategies in one easy-to-navigate location. It is especially useful for reviewing course content while working with the kinds of historical evidence and thinking skills students encounter throughout APUSH.