Oklahoma

=== Borders ===
Oklahoma's border with Kansas was defined as the 37th Parallel in the 1854 [[Kansas–Nebraska Act|Kansas-Nebraska Act]]. This was disputed with the Cherokee and Osage Nations, which claimed their border extended North of this line and could not be part of the [[Kansas Territory]]. This was resolved in 1870 with the [[Drum Creek Treaty]], which reestablished Kansas's southern border as the 37th parallel. This also applied to the then No-Man's Land that became the [[Oklahoma Panhandle]].

The Oklahoma-Texas border consists of the [[Red River of the South]] in the south and the 100th meridian west as the western border between Oklahoma and the Texas Panhandle. These were first established in the 1819 [[Adams–Onís Treaty]] between the United States and Spain.

The Oklahoma panhandle was originally part of the Panhandle of the Republic of Texas, but when Texas joined the Union as a slave state, it could not retain any lands north of 36 degrees 30 minutes, as specified in the [[Missouri Compromise]]. The Panhandle existed as a no-man's land until 1907 when Oklahoma acquired the territory upon gaining statehood.

Oklahoma's Eastern border is divided between Missouri and Arkansas. The Missouri-Oklahoma border is defined as the Meridian passing through the Kawsmouth,<ref>{{Cite book |last=Hoffhaus |first=Charles E. |title=Chez les Canses: three centuries at Kawsmouth: the French foundations of metropolitan Kansas City |date=1984 |publisher=Lowell Press |isbn=0-913504-91-2 |location=Kansas City |oclc=12314083}}</ref> where the Kansas River meets the Missouri River. This is the same Meridian as the Kansas-Missouri border.

The Oklahoma-Arkansas border was originally defined by two lines: the borders between Arkansas and the Cherokee and Choctaw Reservations. This formed two diagonal lines meeting at the western edge of Fort Smith Arkansas, with one line running northeast from the Red River and the other running southeast from the Oklahoma-Arkansas-Missouri border. The Choctaw-Arkansas border was established in the 1820 [[Treaty of Doak's Stand|Treaty of Doak's Sand]], and later refined in the 1830 [[Treaty of Dancing Rabbit Creek]]. These treaties left a 57-acre [[Enclave and exclave|exclave]] of the Choctaw reservation bounded by Arkansas, the Arkansas River and the Poteau River. This became the site of a smuggling camp called "Coke Hill", noted mostly for its importance in cocaine smuggling.<ref>{{Cite news |last=Curry |first=Bill |date=1978-12-07 |title=Arkansas, Oklahoma Fighting Border War Over 57 Acres |language=en-US |newspaper=Washington Post |url=https://www.washingtonpost.com/archive/politics/1978/12/07/arkansas-oklahoma-fighting-border-war-over-57-acres/af020620-9c70-4305-83f6-dc185fc50b46/ |access-date=2022-11-19 |issn=0190-8286}}</ref>

After Petitioning congress to hand over jurisdiction, the 57 acres was given to Arkansas in 1905. The 1985 US Supreme Court Case Oklahoma v. Arkansas decided the land would remain Arkansas, even though the Choctaw had not been notified or asked about the territory being handed over.<ref>{{Cite web |title=Oklahoma v. Arkansas, 473 U.S. 610 (1985) |url=https://supreme.justia.com/cases/federal/us/473/610/ |access-date=2022-11-19 |website=Justia Law |language=en}}</ref> Therefore, the Poteau River serves as the Oklahoma-Arkansas boundary for approximately 1 mile, reducing the Choctaw Reservation and later Oklahoma by 57 acres as established in the treaties of the early 1800s.