The American Civil War: The Definitive Encyclopedia and Document Collection is a comprehensive textbook by Spencer C. Tucker, published by ABC-Clio, LLC in 2013. This hardcover set spans 3032 pages across six volumes, covering the history of the United States during the Civil War period (1850-1877). The set includes a wealth of resources and documents related to this significant period in American history, making it a valuable resource for students, educators, and historians alike. With a focus on the study and teaching of this subject area, this encyclopedia and document collection is a must-have for anyone interested in the Civil War era.