By 1848 the United States had acquired official title to the contiguous land stretching westward to the Pacific, south to the Rio Grande, and north to the 49th parallel. Americans had long since explored and settled in many of these areas, but legitimate possession created an impetus for development that began to crystallize as other
Plains Women: Two Accounts of American Women on the Western Frontier---I Married a Soldier or Old Days in the Old Army & Across the Plains to California in 1852 (Hardcover)
Best Old Wild Wild West Towns in the United States
Frontier myth - Wikipedia
Vintage: American West During the American Frontier Days
How Dodge City Became a Symbol of Frontier Lawlessness, History
Vintage: American West During the American Frontier Days
American Old West, History Wiki
Vintage: American West During the American Frontier Days
Spectacular Photographs Of America's Western Frontier (1867-1874) - Flashbak
Biography: 19th Century photographer Ivan Standl
The American Frontier