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.
United States Regions
Why Have Americans Always Been So Obsessed with the Land?
Westward Expansion Timeline: Behind America's Push West
Tribes - Native Voices
Chapter 2 Introductory Essay: 1607-1763 - Bill of Rights Institute
Why Americans Are So Awful to One Another - The Atlantic
American frontier, Definition, Significance, & Maps
What Is a Frontier Community?
American frontier, Definition, Significance, & Maps
A History of the Ohio Valley (1607–2015), by Peter Paccone