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Note: For ease of reference, present-day boundaries are referenced.
1620
- With the Plymouth Company Grant, England makes the first claim to Wyoming
but never physically explores the land.
1682
- France claims Wyoming east of the Continental Divide; Spain claims land
west of the Divide.
1763
- France surrenders land east of the Continental Divide to Spain, England
controls the land within the Columbia River drainage (Teton and part of
Lincoln, Sublette, and Fremont Counties.)
1800
- By secret treaty with Spain, France regains lands east of the Continental
Divide.
1803
- Louisiana Purchase - United States acquires Wyoming east of the
Continental Divide from France.
1805
- Area east of the Continental Divide becomes part of Louisiana Territory.
1812
- Area east of the Continental Divide becomes part of Missouri Territory.
1819
- United States and Spain establish formal boundaries. The United States
cedes a small portion of Missouri Territory (part of Carbon County) to Spain
and acquires most of Sublette and portions of Sweetwater and Lincoln
Counties.
1821
- Wyoming east of the Divide becomes part of the loosely defined “Indian
Country.”
1845
- Texas Annexation - United States reacquires the part of Carbon County
ceded to Spain in 1819 and purchases the land in 1850.
1846
- Treaty with Great Britain - United States acquires part of present-day
Lincoln, Sublette, Sweetwater, and Teton Counties.
1848
- Treaty with Mexico - United States acquires Uinta and the remainder of
Carbon, Sweetwater, and Lincoln Counties. All of Wyoming is now owned
by the United States.
From 1848 to 1868, portions of Wyoming were administered as part of various
states and territories:
1845-1850
- Texas
1850-1868
- Utah Territory
1848-1859
- Oregon Territory
1859-1863
- Washington Territory
1863-1868
- Idaho Territory
1854-1863
- Nebraska Territory
1861-1863
- Dakota Territory
1864-1868
- Dakota Territory |
