Was a portion of Colorado originally part of Mexico at one time? Indeed it was!

Not only was the state once part of Mexico, but the same portion of Colorado that used to belong to Mexico also became part of the Republic of Texas when it gained independence in the 1830s.

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Was Colorado Part of Mexico at One Time?


Thanks to Mapgeeks.org we can go all the way back to the maps of Old Mexico (1822) to be able to see this is accurate. Before Mexico gained independence from Spain explorers traveled up into parts of Colorado mining gold and establishing the Old Spanish Trail. Once Mexico gained independence, this part of Spanish territory (including a slice of Colorado) went to Mexico.

State Map of Texas Territory Showing Mexico, California and Parts of Colorado

attachment-1823 Map of Texas Territory Showing Mexico and California

The map above comes right after the establishment of the Republic of Mexico in May of 1823. Portions of what once was 'New Spain' were now Mexico extending up to Northern California and included a portion of Colorado.

1827 Map of Mexico Including Texas and Northern California

attachment-1827 Map of Mexico Showing Texas and California

You can see that in 1827, Mexico extended far to the North and followed the Front Range into Colorado. The Spanish followed trails North from Mexico into New Mexico and Colorado with tales of golden cities located throughout the pueblo areas of New Mexico and even more mines in the mountains of Colorado.

Was Colorado Part of Texas at One Time?

attachment-1837 State Map of Texas on the eve of-Independence

By January of 1836, there was a battle coming to the Alamo in San Antonio. Mexican forces squared off against defenders of the Texas territory in a series of battles that would ultimately lead to Texas declaring Independence from Mexico. Important for Colorado was that when Texas broke away from Mexico they wanted all the land in the Texas territory to come with it including that slice of the Colorado Front Range.

See Colorado's Transformation from a Territory to a State

Maps of Colorado County Formations

It took almost 30 years from the time of Texas Independence to the time the Colorado territory was established in 1861.

Scrolling through the photo gallery of maps below, we can see how the Kansas and Nebraska territories helped shape what was left of the Texas territories, and how all of this became the state of Colorado by 1876.

MAPS: See How Colorados County Maps Evolved from 1850 to Today

See the amazing transformation that occurred on Colorado's county maps beginning in the 1860s and evolving into Centennial State we know today. Did you know that in 1866, Summit county went all the way to Utah? That same year, the area that would be known as Grand Junction was originally part of Lake County.

KEEP GOING: Grand Junction Historical Facts You May or May Not Know

We're scrolling through a timeline of Grand Junction history with a look at fun facts you may or may not have known from 1882 to 2020.

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Enjoy a tour through Grand Junction as we check out the listings of historical places throughout Mesa County.

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