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Fredrick Jackson Turner’s thesis of the American frontier defined the study of the American West during the 20th century. In 1893, Turner argued that “American history has been in a large degree the history of the colonization of the Great West. The existence of an area of free land, its continuous recession, and the advance of American settlement westward, explain American development.” (The Frontier in American History, Turner, p. 1.) Jackson believed that westward expansion allowed America move away from the influence of Europe and gain “independence on American lines.” (Turner, p. 4.) The conquest of the frontier forced Americans to become smart, resourceful, and democratic. By focusing his analysis on people in the periphery, Turner de-emphasized the importance of everyone else. Additionally, many people who lived on the “frontier” were not part of his thesis because they did not fit his model of the democratizing American. The closing of the frontier in 1890 by the Superintendant of the census prompted Turner’s thesis.