Question: What is the undergrad enrollment at the school that employed the writer of The Significance of the Frontier in American History?

full_context: Document 1: Frederick Winslow Taylor: Frederick Winslow Taylor (March 20, 1856 -- March 21, 1915) was an American mechanical engineer who sought to improve industrial efficiency. He was one of the first management consultants. Taylor was one of the intellectual leaders of the Efficiency Movement and his ideas, broadly conceived, were highly influential in the Progressive Era (1890s - 1920s). Taylor summed up his efficiency techniques in his 1911 book The Principles of Scientific Management, which in 2001 Fellows of the Academy of Management voted the most influential management book of the twentieth century. His pioneering work in applying engineering principles to the work done on the factory floor was instrumental in the creation and development of the branch of engineering that is now known as industrial engineering. Taylor made his name in, and was most proud of his work in, scientific management; however, he made his fortune patenting steel - process improvements. Taylor was also an athlete who competed nationally in tennis and golf.
Document 2: The End of History and the Last Man: The End of History and the Last Man is a 1992 book by Francis Fukuyama, expanding on his 1989 essay ``The End of History? '', published in the international affairs journal The National Interest. In the book, Fukuyama argues that the advent of Western liberal democracy may signal the endpoint of humanity's sociocultural evolution and the final form of human government.
Document 3: Harvard University: Undergraduate admission to Harvard is characterized by the Carnegie Foundation as "more selective, lower transfer-in". Harvard College accepted 5.3% of applicants for the class of 2019, a record low and the second lowest acceptance rate among all national universities. Harvard College ended its early admissions program in 2007 as the program was believed to disadvantage low-income and under-represented minority applicants applying to selective universities, yet for the class of 2016 an Early Action program was reintroduced.
Document 4: Harvard University: Established originally by the Massachusetts legislature and soon thereafter named for John Harvard (its first benefactor), Harvard is the United States' oldest institution of higher learning, and the Harvard Corporation (formally, the President and Fellows of Harvard College) is its first chartered corporation. Although never formally affiliated with any denomination, the early College primarily trained Congregationalist and Unitarian clergy. Its curriculum and student body were gradually secularized during the 18th century, and by the 19th century Harvard had emerged as the central cultural establishment among Boston elites. Following the American Civil War, President Charles W. Eliot's long tenure (1869–1909) transformed the college and affiliated professional schools into a modern research university; Harvard was a founding member of the Association of American Universities in 1900. James Bryant Conant led the university through the Great Depression and World War II and began to reform the curriculum and liberalize admissions after the war. The undergraduate college became coeducational after its 1977 merger with Radcliffe College.
Document 5: Functional psychology: William James is considered to be the founder of functional psychology. Although he would not consider himself as a functionalist, nor did he truly like the way science divided itself into schools. John Dewey, George Herbert Mead, Harvey A. Carr, and especially James Rowland Angell were the main proponents of functionalism at the University of Chicago. Another group at Columbia, including notably James McKeen Cattell, Edward L. Thorndike, and Robert S. Woodworth, were also considered functionalists and shared some of the opinions of Chicago's professors. Egon Brunswik represents a more recent, but Continental, version. The functionalists retained an emphasis on conscious experience.
Document 6: Harvard University: The Harvard Crimson competes in 42 intercollegiate sports in the NCAA Division I Ivy League. Harvard has an intense athletic rivalry with Yale University culminating in The Game, although the Harvard–Yale Regatta predates the football game. This rivalry, though, is put aside every two years when the Harvard and Yale Track and Field teams come together to compete against a combined Oxford University and Cambridge University team, a competition that is the oldest continuous international amateur competition in the world.
Document 7: Harvard University: Harvard's 2,400 professors, lecturers, and instructors instruct 7,200 undergraduates and 14,000 graduate students. The school color is crimson, which is also the name of the Harvard sports teams and the daily newspaper, The Harvard Crimson. The color was unofficially adopted (in preference to magenta) by an 1875 vote of the student body, although the association with some form of red can be traced back to 1858, when Charles William Eliot, a young graduate student who would later become Harvard's 21st and longest-serving president (1869–1909), bought red bandanas for his crew so they could more easily be distinguished by spectators at a regatta.
Document 8: Harvard University: The Harvard Business School and many of the university's athletics facilities, including Harvard Stadium, are located on a 358-acre (145 ha) campus opposite the Cambridge campus in Allston. The John W. Weeks Bridge is a pedestrian bridge over the Charles River connecting both campuses. The Harvard Medical School, Harvard School of Dental Medicine, and the Harvard School of Public Health are located on a 21-acre (8.5 ha) campus in the Longwood Medical and Academic Area approximately 3.3 miles (5.3 km) southwest of downtown Boston and 3.3 miles (5.3 km) south of the Cambridge campus.
Document 9: Fertile Crescent: The term ``Fertile Crescent ''was popularized by University of Chicago archaeologist James Henry Breasted, beginning with his high school textbooks Outlines of European History in 1914 and Ancient Times, A History of the Early World in 1916. Breasted's 1916 textbook description of the Fertile Crescent:
Document 10: Education: In time, some ideas from these experiments and paradigm challenges may be adopted as the norm in education, just as Friedrich Fröbel's approach to early childhood education in 19th-century Germany has been incorporated into contemporary kindergarten classrooms. Other influential writers and thinkers have included the Swiss humanitarian Johann Heinrich Pestalozzi; the American transcendentalists Amos Bronson Alcott, Ralph Waldo Emerson, and Henry David Thoreau; the founders of progressive education, John Dewey and Francis Parker; and educational pioneers such as Maria Montessori and Rudolf Steiner, and more recently John Caldwell Holt, Paul Goodman, Frederick Mayer, George Dennison and Ivan Illich.
Document 11: The Oregon Trail: Sketches of Prairie and Rocky-Mountain Life: The Oregon Trail: Sketches of Prairie and Rocky-Mountain Life (also published as The California & Oregon Trail) is a book written by Francis Parkman. It was originally serialized in twenty-one installments in "Knickerbocker's Magazine" (1847–49) and subsequently published as a book in 1849. The book is a first-person account of a 2-month summer tour in 1846 of the U.S. states of Nebraska, Wyoming, Colorado, and Kansas. Parkman was 23 at the time. The heart of the book covers the three weeks Parkman spent hunting buffalo with a band of Oglala Sioux.
Document 12: The Significance of the Frontier in American History: ``The Significance of the Frontier in American History ''is a seminal essay by the American historian Frederick Jackson Turner which advanced the Frontier Thesis of American history. It was presented to a special meeting of the American Historical Association at the World's Columbian Exposition in Chicago, Illinois in 1893, and published later that year first in Proceedings of the State Historical Society of Wisconsin, then in the Annual Report of the American Historical Association. It has been subsequently reprinted and anthologized many times, and was incorporated into Turner's 1921 book, The Frontier in American History, as Chapter I.
Document 13: Carl Kaestle: Carl Frederick Kaestle (born March 27, 1940) is University Professor and Professor of Education, History, and Public Policy emeritus at Brown University. His historical research has focused on the development of American schools, particularly in the 1800s. He has worked at the University of Chicago and University of Wisconsin–Madison and is a former president of the National Academy of Education.
Document 14: History of the National Park Service: The national park idea has been credited to the artist George Catlin. In 1832 he traveled the northern Great Plains of the United States, where he became concerned about the destruction of the Indian civilization, wildlife, and wilderness as eastern settlements spread westward. He wrote, ``by some great protecting policy of government... in a magnificent park... a nation's park, containing man and beast, in all the wild (ness) and freshness of their nature's beauty! ''
Document 15: Frederick Jackson Turner: Frederick Jackson Turner (November 14, 1861 – March 14, 1932) was an American historian in the early 20th century, based at the University of Wisconsin until 1910, and then at Harvard. He was primarily known for his “Frontier Thesis.” He trained many PhDs who came to occupy prominent places in the history profession. He promoted interdisciplinary and quantitative methods, often with a focus on the Midwest. He is best known for his essay "The Significance of the Frontier in American History", whose ideas formed the Frontier Thesis. He argued that the moving western frontier shaped American democracy and the American character from the colonial era until 1890. He is also known for his theories of geographical sectionalism. In recent years historians and academics have argued strenuously over Turner's work; all agree that the Frontier Thesis has had an enormous impact on historical scholarship and the American soul.
ground_truth: 7,200
sub_queries: who wrote the significance of the frontier in american history Answer: Frederick Jackson Turner
Frederick Jackson Turner >> employer Answer: Harvard
What is the enrollment of undergraduates at Harvard ? Answer: 7,200