Alpha History is a free online textbook and resource centre for history teachers and students. Alpha History spans 11 popular historical periods – from the American Revolution to the Troubles in Northern Ireland – with more under construction. Each section contains hundreds of resources including topic summaries, documents, images, maps, timelines, biographies of significant individuals and historiographical information. Alpha History also contains a range of online activities, such as quizzes and crosswords. All content at Alpha History is written, reviewed and chosen by qualified teachers, writers and historians.