American frontier - Expansion, Pioneers, Settlers: The discovery of gold in California (1848) started a new sequence of treaties designed to extinguish Indian title to lands lying in the path of the overland routes to the Pacific. The sudden surge of thousands of wagon trains through the last of the Indian country and the consequent slaughtering of prairie and mountain game that provided subsistence for the Indians brought on the most serious Indian wars the country had experienced. For three decades, beginning in the 1850s, raids and sporadic pitched fighting—punctuated by atrocities visited on civilians—took place up and down the western plains. In 1862 hundreds of
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.
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