US Genealogy Map Project
Image provided by "Graphic Maps"
Image provided by "Graphic Maps"
1803 East half of CO included in the Louisiana Purchase from France.
1804 Louisiana Purchase organized into the "District of Louisiana" and the
Territory of Orleans (Louisiana).
1805 "District of Louisiana" reorganized as Territory of Louisiana.
1812 Territory of Louisiana reorganized into Missouri Territory (aka The Indian Country).
1819 Western borders of Missouri Territory set by treaty with Spain.
1848 Treaty with Mexico transfers lands North of the Gila
River (Ariz.) to the U.S. consisting of California, Nevada, Utah,
Western Colorado and New Mexico.
Central Colorado and Eastern New Mexico are claimed by Texas.
1850 Utah Territory (Utah, Nevada-North of 36 degrees 30 min, Western Colorado
and SouthWestern Wyoming) organized.
1850 Texas borders finalized. Central Colorado to the Utah Territory.
1854 Nebraska Territory (Nebraska, NorthEast/NorthCentral Colorado, majority of
Wyoming, WestCentral So.Dakota, Western No.Dakota and majority of Montana)
created from the Missouri Territory.
1854 Kansas Territory (Kansas and Central/Eastern Colorado) created from the Missouri Territory.
1861 Colorado Territory (West half of Colorado) created from the Utah Territory.
1861 Kansas Territory dissolved, remainder (Central/Eastern Colorado) added to the Colorado Territory.
1861 Nebraska Territory reorganized, NorthEast/NorthCentral Colorado added to the Colorado Territory.
1861 ?New Mexico Territory "piece" of Colorado added to the Colorado Territory?
1876 Colorado admitted to the Union as 38th State.
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12/1998 M.A.Leonard, Last Update-01/02/2006