Question: This National Grassland located in Morton County Kansas hosts which monument dedicated to the meeting of states?

Context paragraphs:
Butte Valley National Grassland: Butte Valley National Grassland is a 18425 acre United States National Grassland located in northern California.  Administered by the United States Forest Service, it is located in northern Siskiyou County, near the Oregon border, between the communities of Dorris and Macdoel along U.S. Highway 97.  It was dedicated in July 1991 as the nation's 20th National Grassland.  It is administered as part of the Klamath National Forest, and is the sole National Grassland in California and in Region 5 (Pacific Southwest) of the Forest Service.  Administrative offices are located in Yreka, California.

Cedar River National Grassland: Cedar River National Grassland is a National Grassland located in Sioux County and Grant County in southern North Dakota, United States.  It has a land area of 6717 acre .  The portion in Sioux County lies within the Standing Rock Indian Reservation.  Within the grassland are topographic features such as level plains and rolling hills.  Dry streams and some small flowing streams exist throughout the Grasslands.

Buffalo Gap National Grassland: Buffalo Gap National Grassland is a National Grassland located primarily in southwestern South Dakota, United States.  It is also the second largest National Grassland, after Little Missouri National Grassland in North Dakota.  Characteristics of the grasslands include mixed prairie and chalky badlands.  The grassland is managed by the U.S. Forest Service and is a division of Nebraska National Forest.  In descending order of land area it is located in parts of Fall River, Pennington, Jackson, and Custer counties.

Comanche National Grassland: Comanche National Grassland is a National Grassland located in southeastern Colorado, United States.  It is the sister grassland of Cimarron National Grassland and contains both prairie grasslands and canyons.  It is separated into two sections, each operated by a local ranger district, one of which is in Springfield and the other of which is in La Junta.  The grassland is administered by the Forest Service together with the Pike and San Isabel National Forests, and the Cimarron National Grassland, from common headquarters located in Pueblo, Colorado.

Little Missouri National Grassland: Little Missouri National Grassland is a National Grassland located in western North Dakota, USA.  At 1028051 acres , it is the largest grassland in the country.  Enclaved within its borders is Theodore Roosevelt National Park, which is managed by the National Park Service (and therefore not included in the preceding statistics).  The Little Missouri National Grassland was once a part of the Custer National Forest, but is now a part of the Dakota Prairie Grasslands, a National Forest unit consisting entirely of National Grasslands.  A predominant feature of the grassland is colorful and beautiful badlands, a rugged terrain extensively eroded by wind and water.  It is a mixed grass prairie, meaning it has both long and short grass.

Sheyenne National Grassland: Sheyenne National Grassland is a National Grassland located in southeastern North Dakota in the United States, comprising 70446 acre of public land amid 64,769 acre of privately owned land in a region of sandy soils in the vicinity of the Sheyenne River in Ransom and Richland Counties.  It is the only National Grassland in the tallgrass prairie region of the U.S.  The grassland provides habitat for the largest population of greater prairie chickens in North Dakota, as well as the Dakota skipper butterfly, the western prairie fringed orchid, and numerous ferns, as well as grazing land for approximately 83 cattle ranchers.

Curlew National Grassland: Curlew National Grassland is a National Grassland located in Oneida and Power counties in the state of Idaho, USA.  It has a land area of 47790 acre .  The land used to make the grassland was purchased between the years 1934 and 1942.  The primary goal of the grassland was to improve soil and vegetation in the area.  The grassland is administered by the Forest Service together with the Caribou-Targhee National Forest from common headquarters located in Idaho Falls, Idaho.  There are local ranger district offices in Malad City.

McClellan Creek National Grassland: McClellan Creek National Grassland is a National Grassland located in southern Gray County, Texas, United States.  It was purchased with the goal of restoring badly eroded land to its natural state.  The grassland is administered by the U.S. Forest Service together with Cibola National Forest and Black Kettle, Kiowa, and Rita Blanca National Grasslands, from common headquarters located in Albuquerque, New Mexico.  The grassland is part of the combined Black Kettle and McClellan Creek Ranger District with offices in Cheyenne, Oklahoma.

8 Mile Corner: 8 Mile Corner is a monument in the Cimarron National Grassland dedicated to the tri-point (a place where three states meet) of Kansas, Colorado, and Oklahoma.  This point is also the meeting point for three distinct regions of America - the Western United States (Colorado), Midwestern United States (Kansas) and South Central United States (Oklahoma).  The landmark is a windmill with the three states' abbreviated names on the blades.  The windmill monument was built in 1903.  In 1990, satellite images showed the actual meeting place to be several feet away from the monument.  A brass plate in the ground marks this.  The site is approximately 8 miles west of Elkhart, Kansas on mostly unpaved State Line Road.

Cimarron National Grassland: Cimarron National Grassland is a National Grassland located in Morton County, Kansas, United States, with a very small part extending eastward into Stevens County.  Cimarron National Grassland is located near Comanche National Grassland which is across the border in Colorado.  The grassland is administered by the Forest Service together with the Pike and San Isabel National Forests and the Comanche National Grassland, from common headquarters located in Pueblo, Colorado.  There are local ranger district offices in Elkhart, Kansas.  The grassland is the largest area of public land in the state of Kansas.

Supporting paragraphs: 8 Mile Corner Cimarron National Grassland
Answer: 8 Mile Corner