Book excerpt: Defining Documents in American History: The American West offers a broad range of historical documents on important figures and topics in American West research. Written by historians and experts in the field, this resource examines a wide array of primary source documents with an in-depth critical analysis. Articles begin by introducing the reader to the document's historical context, followed by a description of the author's life and circumstances in which the document was written. A document analysis guides readers in understanding key elements of language, rhetoric, and social and political meaning that define the significance of the author and the document in American history.