问题描述：
Why is there nostalgia for the American frontier days?
What effect does the frontier experience have on Americans?Why is there nostalgia for the American frontier days?Is there anything similar to the frontier experience in the history of your country?
What effect does the frontier experience have on Americans?Why is there nostalgia for the American frontier days?Is there anything similar to the frontier experience in the history of your country?
问题解答：
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