Frederick Jackson Turner, The Significance o f the Frontier in American History New York: Henry Holt and Company, 1921), p. 31.
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Daniel Griswold, «Trading Tyranny for Freedom: How Open Markets Till the Soil for Democracy», Cato Institute, January 6, 2004. http://www.cato.org/publications/trade-policy-analysis/trading-tyranny-freedom-how-open-markets-till-soil-democracy.
