According to Frederick Jackson Turner, the American culture. The United States developed a frontier edge which played a critical role in the development of American culture from other countries because it had declared that all the western lands in the United States had been claimed. Frederick Jackson Turner was an American historian during the early 20th century, based at the University of Wisconsin until 1910, and then Harvard University. He was known primarily for his frontier thesis. He trained many PhDs who became well-known historians.
Turner asserts that the settlement of the west had a considerable impact on American history; in fact, the frontier's influence was so significant that it was inseparably linked to America's identity. Turner also posits that westward expansion allowed Americans to cast aside European influence and develop new ways in the fledgling country.
Therefore, the correct answer is as given above
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