Frederick Jackson Turner's thesis depended on what feature of the United States?

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Turner's thesis, also known as the "frontier thesis," argued that the existence of a continually moving western frontier in the United States had shaped the country's unique identity and character, including its democratic institutions, individualism, and economic opportunities. Turner believed that the closing of the frontier in 1890 marked a turning point in American history, and that the nation needed to find new sources of energy and inspiration to maintain its vitality.

Frederick Jackson Turner's Thesis Depended on What Feature of the United