Herbert Eugene Bolton (July 20, 1870 – January 30, 1953) was an American historian who pioneered the study of the Spanish-American borderlands and was a prominent authority on Spanish American history. He originated what became known as the Bolton Theory of the history of the Americas which holds that it is impossible to study the history of the United States in isolation from the histories of other American nations, and wrote or co-authored ninety-four works. A student of Frederick Jackson Turner, Bolton disagreed with his mentor's Frontier theory and argued that the history of the Americas is best understood by taking a holistic view and trying to understand the ways that the different colonial and precolonial contexts have interacted to produce the modern United States. The height of his career was spent at the University of California, Berkeley where he served as chair of the history department for twenty-two years and is widely credited with making the renowned Bancroft Library the preeminent research center it is today. Early life and education Bolton was born on a farm between Wilton and Tomah, Monroe County, Wisconsin, in 1870 to Edwin Latham and Rosaline (Cady) Bolton. He attended the University of Wisconsin–Madison, where he was a brother of Theta Delta Chi, and graduated with a bachelor's degree in 1895. That same year he married Gertrude Janes, with whom he eventually had seven children. Bolton studied under Frederick Jackson Turner from 1896 to 1897. Starting in 1897, Bolton was a Harrison Fellow at the University of Pennsylvania and studied American history under John Bach McMaster. In 1899, he received his Ph.D. from the University of Pennsylvania and then taught at Milwaukee State Normal School until 1900. Career From 1901 to 1909, Bolton was a history professor at the University of Texas, where he taught medieval and European history. He became interested in the Spanish colonization of the Americas and in summer 1902 began traveling to Mexico in search of historical documents. The Carnegie Institution asked Bolton to write a report of information found about United States history in Mexican archives, and the report was published in 1913. Soon afterward, Bolton became an associate editor of the Quarterly of the Texas State Historical Association (now the Southwestern Historical Quarterly). In 1904, Bolton and Eugene C. Barker published With the Makers of Texas: A Source Reader in Texas History, a textbook. In 1906, Bolton began studying