What the Mediterranean Sea was to the Greeks, breaking the bond of custom, offering new experiences, calling out new institutions and activities, that, and more, the ever retreating frontier has been to the United States directly, and to the nations of Europe more remotely. And now, four centuries from the discovery of America, at the end of a hundred years of life under the Constitution, the frontier has gone, and with its going has closed the first period of American history.

Authentication Score 2


Turner, Frederick Jackson. "The Significance of the Frontier in American History." American Historical Association meeting. 1893, World's Columbian Exposition, Chicago, IL, USA.