The American Historical Association (AHA) is the largest professional organization in the United States devoted to the study and promotion of history and historical thinking. Only the AHA brings together historians from all specializations and professions, embracing their breadth, variety, and ever-changing activity. From its inception, the Association has been committed to the collection, preservation, and dissemination of historical documents. In keeping with that tradition, the AHA staff digitizes and posts essays, reports, and other materials from the Association’s past. As the principal umbrella organization for the profession, the AHA’s history reflects that of the profession as a whole.