American frontier, Definition, Significance, & Maps

American frontier, in United States history, the advancing border that marked those lands that had been settled by Europeans. It is characterized by the westward movement of European settlers from their original settlements on the Atlantic coast in the early 17th century to the Far West in the late 19th century.

WER: Frederick J. Turner / The Significance of the Frontier in American History

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Our scientific frontier

Ocean floor features National Oceanic and Atmospheric Administration

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