The Gale Encyclopedia of U.S. History consists of a series of 2-volume encyclopedias that provides a broad overview of one particular topic throughout American history, from pre-colonial times until today, with special emphasis placed on how the topic--whether war or government and politics--effects, and is affected by, political, economic, and social change in American and global society. Each set is organized chronologically, by era or event, into 10-15 chapters. Each chapter features an introductory essay on the era or event followed by entries grouped under consistent subheads. Each set consists of approximately 400 entries, including subject entries and biographies; 300-350 images, including maps; a chronology; a glossary; sources for further study; and a general index.