In 1942, in "The Frontier and American Institutions: A Criticism of the Turner Thesis," Professor George Wilson Pierson debated the validity of the Turner thesis, stating that many factors influenced American culture besides the looming frontier.
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Urban historian Richard C. Wade challenged the Frontier Thesis in his first asset, The Urban Frontier (1959), asserting that western cities such as Pittsburgh, Louisville, and Cincinnati, not the farmer pioneers, were the catalysts for western expansion.
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