Kansas Territory
The Territory of Kansas was an organized incorporated territory of the United States that existed from May 30, 1854, until January 29, 1861, when the eastern portion of the territory was admitted to the Union as the state of Kansas.
25th meridian west from Washington
On January 1, 1861, the Act Admitting the State of Kansas to the Union defined the western boundary of the new state as the 25th meridian of longitude west from Washington. This rendered the western portion of the Territory of Kansas unorganized. Thirty days later on February 28, 1861, the Act Organizing the Territory of Colorado defined the eastern boundary of the new territory as the 25th meridian of longitude west from Washington. The creation of the Colorado Territory moved the western boundary of the Territory of Nebraska south of the 41st parallel north east to this meridian. These boundaries on the 25th meridian of longitude west from Washington remained when Nebraska became a state on March 1, 1867, and Colorado became a state on August 1, 1876.