The Oxford Companion to United States History" is a comprehensive reference book covering a wide range of topics in American history, from its beginnings to the early 21st century. It includes entries on political, social, cultural, intellectual, scientific, and technological aspects of the nation's history. 
Key Features:
Extensive Coverage: The book contains over 1,400 entries written by approximately 900 historians and scholars. 
Diverse Topics: It explores not only political and military history but also social, cultural, and intellectual trends, science, technology, medicine, the arts, and religion. 
Notable Figures: It includes profiles of prominent figures like George Washington, Abraham Lincoln, Thomas Edison, and Babe Ruth, as well as lesser-known but significant individuals. 
Key Events: The Companion covers major events like the Great Awakening, Bunker Hill, Wounded Knee, and the Vietnam War. 
Scholarly Approach: It is written in clear prose for both researchers and general readers. 
Published by Oxford University Press: The book is part of the Oxford Companions series.