According to the young Wisconsin historian Fredrick Jackson Turner who attended the 1893 Great Columbian Exposition,what crisis did the United States face at the end of the nineteenth century?

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Frederick Jackson Turner argued that the end of the frontier in American history marked a "closing of the frontier," which represented a crisis for the United States. He believed that the frontier had defined American democracy and individualism, and that with its disappearance, the nation would need to find new sources of dynamism and innovation.

According to the Young Wisconsin Historian Fredrick Jackson Turner Who