Other notable explorations included the Pike expedition of 1806–07 by Zebulon Pike, the journey along the north bank of the Platte River in 1820 by Stephen H. Long to what came to be called Longs Peak, the John C. Frémont expedition in 1845–46, and the Powell Geographic Expedition of 1869 by John Wesley Powell.
Platte County, Colorado Territory, an unorganized county of the Territory of Colorado from 1872 to 1874
After her mother-in-law encouraged her to read a book by Janette Oke in 1994, Alexander subsequently began to read every work of Christian fiction she could find and penned her first manuscript in 2000, a historical piece set in the 1870s Colorado Territory and unofficially titled, As High as the Heavens.
His great grandfather, J. Oliver Russell, along with his brothers William G. Russell, Levi Russell and James Russell, discovered gold in the Colorado Territory in 1858 and are credited with founding Denver and starting the Pikes Peak Gold Rush.
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Chivington was named for the Reverend/Colonel John Chivington, who was celebrated as the hero of the 1862 Battle of Glorieta Pass and commanded the Volunteer Militia of the Colorado Territory that perpetrated the Sand Creek massacre, a slaughter of Native Americans in a nearby gulch during the American Civil War.
Clara Blinn (1847–1868) was a white settler who, with her two-year-old son Willie, was captured by Indians in October 1868 in Colorado Territory during an attack on the wagon train in which she and her family were traveling.
In 1861 the 36th United States Congress transferred land previously allocated to the Utah Territory, to the newly created Colorado Territory.
After being devastated financially in the panic of 1857, Shoup moved to Colorado Territory in 1859 to engage in mining and merchandising near Pikes Peak.
On March 3, 1864 the university was founded as the Colorado Seminary by John Evans, the former Governor of Colorado Territory, who had been appointed by President Abraham Lincoln.
As a result, Evans, together with other local business leaders, including David Moffat, William Byers (founder of the Rocky Mountain News), Joseph E. Bates, Bela Hughes, Walter Cheesman and Luther Kountze partnered with East Coast investors to form a railroad company that would link Denver and the Colorado Territory with the national rail network.