Arapahoe County was a county of the United States Territory of Kansas that existed from 1855-08-25, to 1861-01-29.
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On 1855-08-25, the Kansas Territorial Legislature created Arapahoe County to govern the western portion of the Territory of Kansas (in what is now the State of Colorado). The county was named for the Arapaho Nation of Native Americans that lived in the region.
In July 1858, gold was discovered along the South Platte River in Arapahoe County, precipitating the Pike's Peak Gold Rush. To provide local government for the gold mining region, the Kansas Territorial Legislature split Arapahoe County into six counties on 1859-02-07: a much smaller Arapahoe County, Broderick County, El Paso County, Fremont County, Montana County, and Oro County. None of these six counties were ever organized. Many residents of the mining region felt disconnected from the territorial government, and they voted to form their own Territory of Jefferson on 1859-10-24.
Following the Republican Party election victories in 1860, the United States Congress admitted Kansas to the Union.[1] The Kansas Act of Admission excluded the portion of the Kansas Territory west of the 25th meridian west from Washington from the new state, and Arapahoe County and the rest of this region reverted to unorganized territory.
On 1861-02-28, the Colorado Territory was organized to govern this unorganized territory and adjacent areas of the New Mexico Territory, the Utah Territory, and the Nebraska Territory.[2] The new Colorado General Assembly organized 17 counties on 1861-11-01, including a new Arapahoe County for the Colorado Territory.
Another Arapahoe County existed in southwestern Kansas around 1880, when its population was included in the Federal census of that year, but it was never organized. It became defunct in 1883 and its former area was established in 1887 as Haskell County, Kansas.
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