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The human history of Colorado extends back more than 13,000 years. The region that is today the state of Colorado was first inhabited by Native Americans. The Lindenmeier Site in Larimer County, Colorado, is a Folsom culture archaeological site with artifacts dating from approximately 8710 BCE.
When Spanish explorers, early trappers and hunters and gold miners visited and settled in Colorado, the state was populated by Native American tribes. Westward expansion brought European settlers to the area and Colorado's recorded history began with treaties and wars with Mexico and Native American 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, Territory of Jefferson and Territory of Kansas. On August 1, 1876, Colorado was admitted as a state, maintaining its territorial borders.
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 Méjico among the pueblos of the Rio Grande on July 11, 1598. In 1706 Juan de Ulibarri claimed the territory of Colorado. In 1787 Juan Bautista de Anza established the settlement of San Carlos near present-day Pueblo, Colorado, but it quickly failed. This was the only Spanish attempt to create a settlement north of the Arkansas River. Although the Spaniards did not establish permanent settlements in Colorado, they traded with Native Americans who lived there.
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 sovereign. 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, and 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.
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, see Early history of the Arkansas Valley in Colorado.
In 1846 the United States went to war with Mexico, and the defeated nation was forced 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 those headed for the Oregon, the Deseret, or California, usually following the North Platte River and the Sweetwater River to South Pass in what is now Wyoming.
In 1849 and 1850, 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.)
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 1858, 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. 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.
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.
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 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, but territorial ambitions for statehood were thwarted at the end of 1865 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.
The Colorado War (1863–1865) was an armed conflict between the United States and a loose alliance among the Kiowa, Comanche, Arapaho, and Cheyenne tribes 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. 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". The borders of the new state coincided with the borders established for the Colorado Territory. Women won the right to vote in Colorado in 1893. Colorado was the first state in the union to grant this right to women through a popular election. (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. Governor Waite belonged to the Populist Party..
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. 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.
A strike in 1913 resulted in the 1914 Ludlow massacre. 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.
Reports of the revival of molybdenum mining in 2007 resulted in ambivalent responses with Leadville welcoming the opening of the mine at Climax, but strong opposition in Crested Butte over proposed operations at Mount Emmons. Opinion in Rico, site of the Silver Creek stockwork Molybdenum deposit is more divided. There, land slated for development is being bought up by a mining company.
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.
Starting in the 1860s, when tuberculosis (TB) was a world-wide problem, physicians in the eastern United States recommended that their patients travel to sunny Colorado for their health. 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 flocking to Denver, 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." 
The 19th century ended with a difficult law-and-order situation in Colorado, most notably, Creede, Colorado, where gunmen like Robert Ford (the assassin of Jesse James) and con men like Soapy Smith reigned. In the 1920s, the Ku Klux Klan was an important political force in Colorado.
In 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. During WWII, the 10th Mountain Division established Camp Hale to train elite ski troops.
In 1964, the Colorado legislature passed the nation's first liberalized abortion law, written by Richard Lamm, then a state legislator, later governor. 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, when Eric Harris and Dylan Klebold killed 12 students and one teacher before taking their own lives as well.
In 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 in the 2012 Aurora shooting, when James Eagan Holmes, a former neuroscience doctoral student, walked into an Aurora, Colorado Cinemark movie theater with three different guns and started shooting at random at people trying to escape, during a midnight Thursday showing of The Dark Knight Rises. It was the deadliest shooting in Colorado since Columbine and, in terms of both the dead and wounded in the number of casualties, was the deadliest single mass shooting in U.S. history.