On February 28, 1861, with the region’s population booming because of the Pike’s Peak gold rush, Congress creates the new Territory of Colorado. When the United States acquired it after the Mexican War ended in 1848, the land that would one day become Colorado was nearly unpopulated by Anglo settlers. Ute, Arapaho, Cheyenne, and other Indians had occupied the land for centuries, but the Europeans who had made sporadic appearances there since the 17th century never stayed for long. It was not until 1851 that the first permanent non-Indian settlement was established, in the San Luis Valley.
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