What country owned Colorado?

Their territory was explored by the Spanish who, after Napoleon's conquest of Spain, turned over its title to the French. The United States acquired the eastern part of Colorado in 1803 through the Louisiana Purchase and the western portion in 1848 through the Treaty of Guadalupe Hidalgo.



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167 Years Ago the U.S. and Mexico Signed the Treaty of Guadalupe Hidalgo. Denver - Before there was a Colorado, southern and western Colorado were once part of Spain, then Mexico.

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With so many jagged mountain peaks that surround the town, it's easy to see why Ouray is often called the Switzerland of America.

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1. Jefferson Territory, which would later become the State of Colorado, was established at the same time as Denver City. Initially proposed names for the territory included Colona, Osage, and Idaho.

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