Offering exhaustive coverage, detailed analyses, and the latest historical interpretations of events, this expansive, five-volume encyclopedia is the most comprehensive and detailed reference source on the First World War available today. One hundred years after the beginning of World War I in 1914, this conflict still stands as perhaps the most important event of the 20th century. World War I toppled all of the existing empires at the time, transformed the Middle East, and vaulted the United States to becoming the world's leading economic power. Its effects were profound and lasting -- and included outcomes that led to World War II. This multi-volume encyclopedia provides a wide-ranging examination of World War I that covers all of the important battles; key individuals, both civilian and military; weapons and technologies; and diplomatic, social, political, cultural, military, and economic developments. Suitable as a reference tool for high school and undergraduate students as well as faculty members and graduate-level researchers, World War I: The Definitive Encyclopedia and Document Collection offers accessible, in-depth information and up-to-date analyses in a format that lends itself to quick and easy use. The set comprises alphabetically arranged, cross-referenced entries accompanied by further reading selections as well as a comprehensive bibliography. A fifth volume provides chronologically arranged documents and an A-Z index. Features: Provides comprehensive coverage of the causes of the war that allows readers to fully understand the complex origins of such a monumental conflict; Supplies detailed analyses and explanations of the events before, during, and after World War I, such as how the results of the war set the stage for the global Great Depression of the 1930s, as well as detailed biographical data on key military and civilian individuals during World War I; Includes a chronologically organized document volume that enables students to examine the sources of historical information firsthand; Covers all key battles, land and sea, and their impacts, as well as the critical technological developments that affected the war's outcomes. - Publisher.