History of Colorado

Last updated
Roxborough State Park Roxborough.jpg
Roxborough State Park
East Spanish Peak, Sangre de Cristo Mountains Spanish Peaks.JPG
East Spanish Peak, Sangre de Cristo Mountains

The human history of Colorado extends back more than 14,000 years. The region that is today the state of Colorado was first inhabited by Native American people. The Lindenmeier Site in Larimer County, Colorado, is a Folsom culture archaeological site with artifacts dating from approximately 8710 BC.


When explorers, early trappers, hunters, and gold miners visited and settled in Colorado, the state was populated by American Indian nations. Westward expansion brought European settlers to the area and Colorado's recorded history began with treaties and wars with Mexico and American Indian nations to gain territorial lands to support the transcontinental migration. In the early days of the Colorado gold rush, Colorado was a Territory of Kansas and Territory of Jefferson. On August 1, 1876, Colorado was admitted as a state, maintaining its territorial borders.

Historic Native American people

Chief Ouray and Chipeta Chief Ouray - Brady-Handy.jpg
Chief Ouray and Chipeta

European settlement

Juan De Onate, first Governor of New Spain NEW MEXICO San Juan Pueblo DonJuan De Onate First Govenor of New Spain.jpg
Juan De Oñate, first Governor of New Spain

The first Europeans to visit the region were Spanish conquistadors. Juan de Oñate who lived until 1626, founded what would become the Spanish province of Santa Fé de Nuevo México among the pueblos of the Rio Grande on July 11, 1598. In 1706 Juan de Ulibarri claimed the territory of Colorado.[ citation needed ] In 1787 Juan Bautista de Anza established the settlement of San Carlos near present-day Pueblo, Colorado, but it quickly failed. [1] This was the only Spanish attempt to create a settlement north of the Arkansas River. Colorado became part of the Spanish province of Santa Fe de Nuevo México as part of the Viceroyalty of New Spain. [2] The Spaniards traded with Native Americans who lived there and established the Comercio Comanchero (Comanche Trade) among the Spanish settlements and the Native Americans. [3]

In 1803 the United States acquired a territorial claim to the eastern flank of the Rocky Mountains by the Louisiana Purchase from France. However, the claim conflicted with Spain's claim to sovereignty over the territory. Zebulon Pike led a U.S. Army reconnaissance expedition into the disputed region in 1806. Pike and his men were arrested by Spanish cavalry in the San Luis Valley, taken to Chihuahua, then expelled from México.

Miguel Hidalgo y Costilla declared Mexico's independence from Spain on September 16, 1810. In 1819, the United States ceded its claim to the land south and west of the Arkansas River to Spain with the Adams-Onís Treaty, at the same time purchasing Florida. Mexico finally won its independence with the Treaty of Córdoba signed on August 24, 1821, and assumed the territorial claims of Spain. Although Mexican traders ventured north, settlers stayed south of the 37th parallel north until the United States signed a peace treaty with the Ute Nation in 1850.

Trading posts such as Bent's Old Fort served fur traders in the early 19th century. BentsFort.jpg
Trading posts such as Bent's Old Fort served fur traders in the early 19th century.

During the period 1832 to 1856, traders, trappers, and settlers established trading posts and small settlements along the Arkansas River, and on the South Platte near the Front Range. Prominent among these were Bent's Fort and Fort Pueblo on the Arkansas and Fort Saint Vrain on the South Platte. The main item of trade offered by the Indians was buffalo robes, [4] see Early history of the Arkansas Valley in Colorado and Forts in Colorado.

In 1846 the United States went to war with Mexico. Mexico's defeat forced the nation to relinquish its northern territories by the Treaty of Guadalupe Hidalgo in 1848. This opened the Southern Rocky Mountains to American settlement, including what is now the lower portion of Colorado. The newly gained land was divided into the Territory of New Mexico and the Territory of Utah, both organized in 1850, and the Territory of Kansas and the Territory of Nebraska, organized in 1854. Most settlers avoided the rugged Rocky Mountains and headed for Oregon, the Deseret, or California, usually following the North Platte River and the Sweetwater River to South Pass in what is now Wyoming.

On April 9, 1851, Hispanic settlers from Taos, New Mexico, settled the village of San Luis, then in the New Mexico Territory, but now Colorado's first permanent European settlement.

Pike's Peak Gold Rush

Pikes Peak, Albert Bierstadt Bierstadt Albert Pikes Peak.jpg
Pikes Peak, Albert Bierstadt

On June 22, 1850, a wagon train bound for California crossed the South Platte River just north of the confluence with Clear Creek, and followed Clear Creek west for six miles. Lewis Ralston dipped his gold pan in a stream flowing into Clear Creek, and found almost $5 in gold (about a quarter of a troy ounce) in his first pan. John Lowery Brown, who kept a diary of the party's journey from Georgia to California, wrote on that day: "Lay bye. Gold found." In a notation above the entry, he wrote, "We called this Ralston's Creek because a man of that name found gold here.”

Ralston continued on to California, but returned to 'Ralston's Creek' with the Green Russell party eight years later. Members of this party founded Auraria (later absorbed into Denver City) in 1858 and touched off the gold rush to the Rockies. The confluence of Clear Creek and Ralston Creek, the site of Colorado's first gold discovery is now in Arvada, Colorado.

In 1858, several parties of gold seekers bound for the California Gold Rush panned small amounts of gold from various streams in the South Platte River Valley at the foot of the Rocky Mountains in then western Kansas Territory, now northeast Colorado. The gold nuggets initially failed to impress the gold seekers, but rumors of gold in the Rocky Mountains persisted, and several small parties explored the region. In the summer of 1857, a party of Spanish-speaking gold seekers from the New Mexico Territory worked a placer deposit along the South Platte River about 5 miles (8 km) above Cherry Creek (in what is today the Overland Park neighborhood of Denver.) [5]

The following year, William Greeneberry "Green" Russell led a party of Cherokee gold seekers from the State of Georgia to search for gold along the South Platte River. In the first week of July 1857, Green Russell and Sam Bates found a small placer deposit near the mouth of Little Dry Creek (in present-day Englewood) that yielded about 20 troy ounces (622 grams) of gold, the first significant gold discovery in the Rocky Mountain region.

News of this discovery soon spread and precipitated the Pike's Peak Gold Rush. [6] An estimated 100,000 gold seekers flocked to the region over the next three years. The placer gold deposits along the rivers and streams of the region rapidly played out, but miners soon discovered far more valuable seams of hard rock gold, silver, and other minerals in the nearby mountains. This gold rush helped to attract people to the state and resulted in a population boom.

Territory of Jefferson

The Provisional Government of the Territory of Jefferson was organized on October 24, 1859, but the new territory failed to secure federal sanction. The Provisional Government freely administered the region despite its lack of official status until the U.S. Territory of Colorado was organized in 1861.

Territory of Colorado

William Gilpin, first Governor of Colorado Territory William gilpin.jpg
William Gilpin, first Governor of Colorado Territory

The Territory of Colorado was a historic, organized territory of the United States that existed between 1861 and 1876. Its boundaries were identical to the current State of Colorado. The territory ceased to exist when Colorado was admitted to the Union as a state on August 1, 1876. The territory was organized in the wake of the 1859 Pike's Peak Gold Rush, which had brought the first large concentration of white settlement to the region. The organic act [7] creating the territory was passed by Congress and signed by President James Buchanan on February 28, 1861, during the secessions by Southern states that precipitated the American Civil War. The organization of the territory helped solidify Union control over a mineral rich area of the Rocky Mountains.

Statehood was regarded as fairly imminent, as during the run-up to the 1864 presidential election the Republican–controlled Congress was actually eager to get two more Republican senators and three more electoral votes for President Lincoln's re-election bid. Territorial Governor John Evans persuaded Congress to adopt an enabling act, but a majority of the 6,192 Coloradoans who voted, in a population of around 35,000, turned down the first attempt at a state constitution and the second attempt at statehood. [8] Later, at the end of 1865, territorial ambitions for statehood were thwarted again, this time by a veto by President Andrew Johnson. Statehood for the territory was a recurring issue during the Ulysses Grant administration, with Grant advocating statehood against a less willing Congress during Reconstruction.

Colorado War

The Colorado War (1863–1865) was an armed conflict between the United States and a loose alliance among the Kiowa, Comanche, Arapaho, and Cheyenne nations of Native Americans (the last two were particularly closely allied). The war was centered on the Eastern Plains of the Colorado Territory and resulted in the removal of these four Native American peoples from present-day Colorado to present-day Oklahoma. The war included a particularly notorious episode in November 1864 known as the Sand Creek Massacre. The battle, initially hailed by the U.S. press as a great victory, was later learned to be one of genocidal brutality. The resulting hearings in the United States Congress regarding the malfeasance of the U.S. Army commander, John Chivington, were a watershed in the white views of the Indian Wars at the close of the American Civil War. In 1868 the U.S. Army, led by George Armstrong Custer, renewed the conflict against the Arapaho and Cheyenne at the Battle of Washita River.


The United States Congress passed an enabling act on March 3, 1875, specifying the requirements for the Territory of Colorado to become a state. [9] On August 1, 1876 (28 days after the Centennial of the United States), U.S. President Ulysses S. Grant signed a proclamation admitting the state of Colorado to the Union as the 38th state and earning it the moniker "Centennial State". [10] The borders of the new state coincided with the borders established for the Colorado Territory.

Women won the right to vote in Colorado via referendum on November 7, 1893. Colorado was the first state in the union to grant universal suffrage through a popular vote. (Wyoming approved the right of women to vote in 1869 through a vote of the territorial legislature.)

Governor Davis H. Waite campaigned for the Constitutional amendment granting women the right to vote in Colorado. Governor Waite is also noted as one of the few elected officials ever to call out the state militia to protect miners from a force raised by mine owners[ citation needed ]. Governor Waite belonged to the Populist Party.

Mining in Colorado

Colorado Mineral Belt CO Mineral Belt.jpg
Colorado Mineral Belt

Participants in the Pike's Peak Gold Rush from 1858 to 1861 were called Fifty-Niners and many of the new arrivals settled in the Denver area. Gold in paying quantities was also discovered in the Central City area. In 1879, silver was discovered in Leadville, resulting in the Colorado Silver Boom.

Many early mining efforts were cooperative ventures. However, as easy-to-reach surface deposits played out, miners increasingly turned to hard rock mining. Such industrial operations required greater capital, and the economic concept of mineral rights resulted in periodic conflicts between the mine owners, and the miners who increasingly sold their labor to work in the mines.

As the mines were dug deeper, they became more dangerous, and the work more arduous, creating the conditions for conflict. In 1880, Colorado Governor Pitkin, a Republican, declared martial law to suppress a violent mining strike at Leadville. In the 1890s many Colorado miners began to form unions in order to protect themselves. The mine operators often formed mine owners' associations in response, setting up the conditions for a conflict. Notable labor disputes between hard rock miners and the mine operators included the Cripple Creek strike of 1894 and the Colorado Labor Wars of 1903–04.

Coal mining in Colorado began soon after the first settlers arrived. Although the discovery of coal did not cause boom cycles as did the precious metals, the early coal mining industry also established the conditions for violent confrontations between miners and mine owners. The usual issues were wages, hours, and working conditions, but miners were also concerned about issues of fairness, and company control over their personal lives.

Early coal mining in Colorado was extremely dangerous, and the state had one of the highest death rates in the nation. During the three decades from 1884 to 1914, more than 1700 men died in Colorado's coal mines. [11] Coal miners also resented having to pay for safety work such as timbering the mines, and they were sometimes paid in scrip that had value only in the company store, with the cost of goods set by the company.

The Colorado Coalfield War, centered around the 1913-1914 United Mine Workers of America strike against the Rockefeller-owned Colorado Fuel and Iron company, saw dozens die in battles on the Southern Colorado coalfields. The Ludlow Massacre became the peak of the violence, when Colorado National Guard and militia fired into a tent colony of strikers, killing over a dozen women and children. The violence would continue until Woodrow Wilson sent federal soldiers to disarm both sides.

Another coal strike in 1927 is best known for Colorado's first Columbine massacre. In 1933, federal legislation for the first time allowed all Colorado coal miners to join unions without fear of retaliation.

Like all resource extraction, mining is a boom or bust industry, and over the years many small towns were established, then abandoned when the ore ran out, the market collapsed, or another resource became available. There were once more than a hundred coal mines in the area north of Denver and east of Boulder. The mines began to close when natural gas lines arrived. Coal and precious metals are still mined in Colorado, but the mining industries have changed dramatically in recent decades.

Tuberculosis patients lie in beds on the porch of a building at the Jewish Consumptive Relief Society (J.C.R.S.) sanatorium National Jewish Hospital2.jpg
Tuberculosis patients lie in beds on the porch of a building at the Jewish Consumptive Relief Society (J.C.R.S.) sanatorium

Reports of the revival of molybdenum mining in 2007 resulted in ambivalent responses [12] with Leadville welcoming the opening of the mine at Climax, [13] [14] but strong opposition in Crested Butte over proposed operations at Mount Emmons. [15] Opinion in Rico, site of the Silver Creek stockwork Molybdenum deposit [16] is more divided. There, land slated for development is being bought up by a mining company. [17]

Today there are many small mining towns scattered throughout Colorado, such as Leadville, Georgetown, Cripple Creek, Victor, and Central City. Although many of the mines no longer operate, the remnants of the operations can be seen in the form of mine shafts, outbuildings, and mounds of rock extracted from the hills. Many former mining towns turned to gambling to draw visitors, with Blackhawk and Cripple Creek serving as good examples. The 19th century ended with a difficult law-and-order situation in some places, most notably, Creede, Colorado, where gunmen like Robert Ford (the assassin of Jesse James) and con men like Soapy Smith reigned.

"The World's Sanitarium"

Starting in the 1860s, when tuberculosis (TB) was a major deadly disease, physicians in the eastern United States recommended that their patients relocate to sunny, dry climates for their lungs. As a result, the number of people with tuberculosis, called "lungers", in the state grew alarmingly and without the services or facilities to support their needs. Not knowing how to manage a population of homeless, ill people, many were taken to jail. Because of the number of people with TB and their families who came to Denver for their health, by the 1880s it was nicknamed the "World's Sanitarium". Cynthia Stout, a history scholar, asserted that by 1900 "one-third of Colorado's population were residents of the state because of tuberculosis." [18] [19]

Twentieth century

Branding cattle on a Colorado ranch, c. 1900 Colorado - Branding Calves c. 1900.jpg
Branding cattle on a Colorado ranch, c. 1900

In the early 1920s, the Ku Klux Klan was an important political force in Colorado, but it was unable to get any of its proposals enacted into law, and it died out by 1930. [20]

The 1930s saw the beginning of the ski industry in Colorado. Resorts were established in areas such as Estes Park, Gunnison, and on Loveland Pass. [21] During WWII, the 10th Mountain Division established Camp Hale to train elite ski troops. [22]

In the 1940s, the Republican governor of Colorado, Ralph Carr, spoke out against racial discrimination and against the federal internment of Japanese-Americans during World War II.

In 1967, Governor John A. Love signed the nation's first liberalized abortion law. [23] The late 1960s saw violence in Denver, in the form of race riots, and college buildings being burned by radicals.

In 1972, Colorado became the only state to reject the award of hosting the Olympic Games after they had been granted. When Representative Lamm led a successful movement to reject a bond issue for expenses related to hosting the event, the International Olympic Committee relocated the 1976 Winter Olympics to Innsbruck, Austria. No venue had rejected the award before nor has any venue since.

In 1999, the Columbine High School massacre became the most devastating high-school massacre in United States history until the Marjory Stoneman Douglas High School Shooting in 2018. [24]

Twenty-first century

On July 20, 2012, not far from the location of the aforementioned massacre at Columbine High School, 12 people were killed and 70 people were injured [25] in the 2012 Aurora, Colorado shooting, when James Eagan Holmes, a former neuroscience doctoral student, walked into an Aurora, Colorado Cinemark movie theater with multiple firearms, and started shooting at random at people trying to escape during a midnight Thursday showing of The Dark Knight Rises , killing 12 people and injuring 70 others. [26] It was the deadliest shooting in Colorado since the Columbine High School massacre and, in terms of both the dead and wounded in the number of casualties, was the largest single mass shooting in U.S. history. [27]

Colorado is now 1 of 15 states [28] that have legalized both medical and recreational marijuana, allowing them to tax the product. As of July 2014, six months after recreational shops began sales of marijuana in Colorado, the state has enjoyed a tax revenue of 45 million with 98 million expected by the end of the calendar year. This is in addition to increased economic revenues from "pot tourists."

As of July 9, 2020, the COVID-19 Pandemic has affected over 35000 people in Colorado and killed 1544. [29]

See also

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North America (orthographic projection).svg North America
Flag of the United States.svg United States
Flag of Colorado.svg Colorado

Related Research Articles

Colorado State of the United States of America

Colorado is a state in the Mountain West subregion of the Western United States. It encompasses most of the Southern Rocky Mountains as well as the northeastern portion of the Colorado Plateau and the western edge of the Great Plains. Colorado is the eighth most extensive and 21st most populous U.S. state. The 2020 United States Census enumerated the population of the State of Colorado at 5,773,714, an increase of 14.80% since the 2010 United States Census. Colorado gained an 8th Congressional District.

Pikes Peak Gold Rush

The Pike's Peak Gold Rush was the boom in gold prospecting and mining in the Pike's Peak Country of western Kansas Territory and southwestern Nebraska Territory of the United States that began in July 1858 and lasted until roughly the creation of the Colorado Territory on February 28, 1861. An estimated 100,000 gold seekers took part in one of the greatest gold rushes in North American history.

Jefferson County, Colorado County in Colorado, United States

Jefferson County, is a county located in the U.S. state of Colorado. As of the 2010 census, the population was 534,543, making it the fourth-most populous county in Colorado. The county seat is Golden, and the most populous city is Lakewood.

South Park (Park County, Colorado)

South Park is a grassland flat within the basin formed by the Rocky Mountains' Mosquito and Park Mountain Ranges within central Colorado. This high valley ranges in elevation from approximately 9,000 to 10,000 ft. It encompasses approximately 1,000 square miles around the headwaters of the South Platte River in Park County approximately 60 mi (100 km) southwest of Denver. It is the largest and southernmost of three similarly named high altitude basins in the Front Range of Colorado, the others being North Park and Middle Park. The largest town in the basin is Fairplay, with a population of 681.

Colorado Territory

The territory was organized in the wake of the Pike's Peak Gold Rush of 1858–1861, which brought the first large concentration of white settlement to the region.

Jefferson Territory

The Territory of Jefferson was an extralegal and unrecognized United States territory that existed from October 24, 1859 until the creation of the Colorado Territory on February 28, 1861. The Jefferson Territory included land officially part of the Kansas Territory, the Nebraska Territory, the New Mexico Territory, the Utah Territory, and the Washington Territory, but the area was remote from the governments of those five territories. The government of the Jefferson Territory, while democratically elected, was never legally recognized by the United States government, although it managed the territory with relatively free rein for 16 months. Many of the laws enacted by the Jefferson Territorial Legislature were reenacted and given official sanction by the new Colorado General Assembly in 1861.

William Larimer Jr.

William Larimer Jr. was a Kansas state senator, American settler, and land developer who is best known as the founder of Denver, Colorado, in 1858. Larimer often went by "General Larimer", having acquired the title in the Pennsylvania Militia.

Colorado War 19th-century armed conflict of the American Indian Wars

The Colorado War was an Indian War fought in 1864 and 1865 between the Southern Cheyenne, Arapaho, and allied Brulé and Oglala Sioux peoples versus the U.S. army, Colorado militia, and white settlers in Colorado Territory and adjacent regions. The Kiowa and the Comanche played a minor role in actions that occurred in the southern part of the Territory along the Arkansas River. The Cheyenne, Arapaho, and Sioux played the major role in actions that occurred north of the Arkansas River and along the South Platte River, the Great Platte River Road, and the eastern portion of the Overland Trail. The United States government and Colorado Territory authorities participated through the 1st Colorado Cavalry Regiment, often called the Colorado volunteers. The war was centered on the Colorado Eastern Plains, extending eastward into Kansas and Nebraska.

Montana City, Colorado

Montana City was the first settlement in what was later to become Denver, Colorado. It was established during the Pikes Peak Gold Rush on the east bank of the South Platte River, just north of the confluence with Little Dry Creek, in 1858. At the time, the site was in the Kansas Territory.

The history of Denver details the history of the City, and County of Denver, Colorado, the United States from its founding in 1858 to modern-day. Located on the banks of the South Platte River close to the foothills of the Rocky Mountains, Denver was founded in November 1858 as a gold mining town. The gold quickly dried up and the city moved to become a supply hub for new mines in the mountains. Denver grew rapidly, becoming the new county seat of Arapahoe County and eventually the state capital. Investors from Denver built a rail line from Cheyenne to western Kansas which traveled through Denver, bringing new people and supplies. New roads and improvements to rail and air travel in the early twentieth century made Denver a hub for transportation. Until World War II Denver's economy was dependent mainly on the processing and shipping of minerals and ranch products. With war looming, Denver was in a prime location for more federal activity, being situated far from either coast. After the war, oil and gas companies fueled a skyscraper boom in the downtown area. With the combined spending of the energy companies and the federal government, Denver expanded quickly. Denver went from having a small urban core surrounded by rural farms to a booming downtown dotted with skyscrapers and surrounded by growing suburbs.

Georgia Gold Rush

The Georgia Gold Rush was the second significant gold rush in the United States and the first in Georgia, and overshadowed the previous rush in North Carolina. It started in 1829 in present-day Lumpkin County near the county seat, Dahlonega, and soon spread through the North Georgia mountains, following the Georgia Gold Belt. By the early 1840s, gold became difficult to find. Many Georgia miners moved west when gold was found in the Sierra Nevada in 1848, starting the California Gold Rush. Since the 16th century, American Indians in Georgia told European explorers that the small amounts of gold which they possessed came from mountains of the interior. Some poorly documented accounts exist of Spanish or French mining gold in North Georgia between 1560 and 1690, but they are based on supposition and on rumors passed on by Indians. In summing up known sources, W.S. Yeates observed: "Many of these accounts and traditions seem to be quite plausible. Nevertheless, it is hardly probable that the Spaniards would have abandoned mines which were afterwards found to be quite profitable, as those in North Georgia."

William Greeneberry "Green" Russell (1818–1877) was an American prospector and miner.

Early coal mining in Colorado in the United States was spread across the state. Some early coal mining areas are currently inactive, including the Denver Basin and Raton Basin coal fields along the Front Range. There are currently 11 active coal mines, all in western Colorado.

Gold mining in Colorado Overview of gold mining in Colorado

Gold mining in Colorado, a state of the United States, has been an industry since 1858. It also played a key role in the establishment of the state of Colorado.

Arapahoe County was a county of Kansas Territory in the United States that existed from August 25, 1855, until Kansas's admission into the Union on January 29, 1861.

Arapahoe County was a county of the extralegal United States Territory of Jefferson that existed from November 28, 1859, until February 28, 1861. The county name was also spelled Arapaho County, Arapahoe County, Arapahoe County, and Arapahoe County. The county seat was Denver City.

Index of Colorado-related articles Wikipedia list article

The following is an alphabetical list of articles related to the U.S. state of Colorado.

Russell Gulch, Colorado

Russell Gulch, Colorado, is a former mining town, now largely a ghost town, in Gilpin County, Colorado, United States. Although the population was once much larger than today, and most of the larger commercial buildings stand empty, the town is not completely deserted.

Outline of Colorado Overview of and topical guide to Colorado

The following outline is provided as an overview of and topical guide to the U.S. state of Colorado:

Little Raven (Arapaho leader)

Little Raven, also known as Hosa, was from about 1855 until his death in 1889 a principal chief of the Southern Arapaho Indians. He negotiated peace between the Southern Arapaho and Cheyenne and the Comanche, Kiowa, and Plains Apache. He also secured rights to the Cheyenne-Arapaho Reservation in Indian Territory.


  1. Carl Ubbelohde, Duane A. Smith, Maxine Benson: A Colorado History, Pruett Publishing, 2006, p. 17
  2. Cardelús, Borja (2007). La huella de España y de la cultura hispana en los Estados Unidos (2nd ed.). Madrid: Centro de Cultura Iberoamericana (CCI). p. 174. ISBN   9788461150366.
  3. Torres, Fernando Martínez Láinez, Carlos Canales (2008). Banderas lejanas : la exploración, conquista y defensa por España del territorio de los actuales Estados Unidos (1st ed.). Madrid: Edaf. ISBN   9788441421196.
  4. Janet Lecompte, Pueblo, Hardscrabble, Greenhorn: The Upper Arkansas, 1832-1856, University of Oklahoma Press, 1977, hardcover, 354 pages, ISBN   0-8061-1462-2
  5. Thomas J. Noel. "Denver History: The Arapaho Camp". City and County of Denver. Archived from the original on 2007-10-13. Retrieved 2008-03-03.
  6. Gehling, Richard (2006). "The Pike's Peak Gold Rush". Richard Gehling. Archived from the original on 2008-06-28. Retrieved 2007-06-12.
  7. "An Act to provide a temporary Government for the Territory of Colorado" (PDF). Thirty-sixth United States Congress. February 28, 1861. Retrieved 2006-12-27.
  8. Kopel, Jerry (July 30, 2000). "History of how Colorado finally became a state" (PDF). Retrieved February 24, 2017.[ permanent dead link ]
  9. Forty-third United States Congress (1875-03-03). "An Act to Enable the People of Colorado to Form a Constitution and State Government, and for the Admission of the Said State into the Union on an Equal Footing with the Original States". Archived from the original (PDF) on 2008-05-07. Retrieved 2008-04-14.
  10. President of the United States of America (1876-08-01). "Proclamation of the Admission of Colorado to the Union" (php). The American Presidency Project. Retrieved 2008-04-14.
  11. James Whiteside, Regulating danger: the struggle for mine safety in the Rocky Mountain coal industry, U of Nebraska Press, 1990, page xii (preface)
  12. "Colorado mining divided over molybdenum" article by Jason Blevins in The Denver Post Last Updated: 12/09/2007 08:06:50 AM MST
  13. "Freeport-McMoRan Copper & Gold Inc. Announces Plans to Restart Climax Molybdenum Mine" Archived 2008-01-22 at the Wayback Machine Press release by Freeport-McMoRan Copper & Gold Inc. December 4, 2007
  14. "Many ready to again embrace old path to prosperity" article by Jason Blevins in The Denver Post Last Updated: 12/09/2007 02:07:37 AM MST
  15. "Coalitions build to again keep mining off beloved peak" article by Jason Blevins in The Denver Post Last Updated: 12/09/2007 02:09:08 AM MST
  16. "Hydrothermal alteration and mass exchange in the hornblende latite porphyry, Rico, Colorado" Contributions to Mineralogy and Petrology, Springer Berlin/Heidelberg, ISSN   0010-7999 (Print) ISSN   1432-0967 (Online), Volume 116, Numbers 1-2 / March, 1994, doi : 10.1007/BF00310700, Pages 199-215, Wednesday, December 1, 2004
  17. "Divided town weighs promise of jobs vs. peace and quiet" article by Nancy Lofholm in The Denver Post Last Updated: 12/09/2007 02:07:13 AM MST
  18. Tuberculosis in Colorado history, The Denver Post, 05/31/2007. Retrieved 2011-06-16
  19. Varnell, pp. 39-40.
  20. William Wyckoff (1999). Creating Colorado: The Making of a Western American Landscape, 1860-1940. Yale UP. p. 267.
  21. Colorado Ski History.com. 1930-1939. Retrieved 3 November 2011
  22. 10th Mountain Division History Archived 2010-07-24 at the Wayback Machine Metropolitan State College of Denver, 2004. Retrieved January 30, 2010.
  23. "Colorado Abortion Law is Signed by Gov. Love". Lincoln Evening Journal. April 26, 1967. p. 2. Retrieved July 10, 2015 via Newspapers.com. Open Access logo PLoS transparent.svg
  24. "Investigators focus on accomplices in school shooting". Santa Cruz Sentinel. April 28, 1999. p. 15. Retrieved July 10, 2015 via Newspapers.com. Open Access logo PLoS transparent.svg
  25. "Officials release complete list of injured victims in Aurora massacre"
  26. "Officials release complete list of injured victims in Aurora massacre". Fox News Channel. January 10, 2013. Retrieved July 4, 2013.
  27. Brown, Jennifer (July 21, 2012). "12 shot dead, 58 wounded in Aurora movie theater during Batman premier". The Denver Post. Retrieved July 21, 2012.
  28. http://www.businessinsider.com/marijuana-states-legalized-weed-2016-11
  29. https://covid19.colorado.gov/data/case-data.Missing or empty |title= (help)

Further reading

Primary sources

Coordinates: 38°59′50″N105°32′52″W / 38.9972°N 105.5478°W / 38.9972; -105.5478 (Geometric center of the State of Colorado)