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The Ancestral Pueblo begin building pueblos in what is now the Four Corners area.

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The Ancestral Pueblo abandon what is now the Four Corners area of Colorado.

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Eastern Colorado was claimed for Spain.

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Explorer Juan de Ulibarrí claims Colorado for Spain.

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Fathers Dominguez and Escalante explore what later becomes the Old Spanish Trail.

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The United States obtains eastern Colorado as part of the Louisiana Purchase.

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Zebulon Pike leads an expedition to explore the Arkansas River of what is now Colorado.

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Lieutenant Stephen Long leads an expedition to what is now Rocky Mountain National Park.

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Bent’s Fort is established as part of the fur trade.

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Army Captain John C. Fremont leads the first of four expeditions to the Rockies.

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A treaty with Mexico transfers the huge area north of the Rio Grande to the United States.

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Spanish-speaking families move north from New Mexico to settle the San Luis Valley.

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The U.S. Army builds Fort Garland in the San Luis Valley to control Indian raids.

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The first gold rush in Colorado occurs; Denver is founded.

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The Colorado Territory is established.

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Hundreds of Native Americans are killed in the Sand Creek Massacre.

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The railroads reach Colorado.

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Colorado becomes the 38th state.

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The “silver boom” creates new towns and cities, like Leadville and Aspen.

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The end of the silver boom hits Colorado hard; ghost towns appear in the Rockies.

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The Denver U.S. Mint begins operation.

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Denver hosts its first national political convention.

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The Colorado legislature (lawmaking body) creates the nation’s first Columbus Day holiday.

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The Ludlow Massacre draws national attention to southern Colorado.

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The Dust Bowl begins on the eastern Plains, driving farm families away.

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World War II brings quick growth to Colorado; Denver’s first freeway is built.

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The U.S. Air Force Academy opens north of Colorado Springs.

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The Denver Broncos football team becomes Colorado’s first professional sports team.

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The North American Aerospace Defense Command (NORAD) is completed.

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The U.S. Census lists Colorado as having over one million people for the first time

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The Colorado Rockies take the field for their first baseball season.

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The Denver International Airport opens.

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Coloradoans elect Governor Bill Owens, the first Republican governor in 24 years.

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twelve students and one teacher are murdered and 21 other students are wounded in a mass shooting at Columbine High School.

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The Colorado Avalanche wins their second Stanley Cup.

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Denver hosts its second national party convention.

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Colorado’s population grows to more than five million.

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A gunman opens fire in a cinema in Aurora, killing 12 people and wounding 58 more.

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Colorado becomes the first state to legalize marijuana for recreational use.

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Boulder native Neil Gorsuch is appointed to the United States Supreme Court.