Respuesta :

Ahnjong

Explanation:

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 (17th century) to the Far West (19th century).
Introduction. NASA. It is where civilization advances upon the wilderness; it is that thin geographical line where the old and the new, the tried and the untried, meet and reshape each other; it is often dangerous, always exciting. It is called the frontier.

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