Greer County, a county created by the Texas legislature on February 8, 1860 (and was named for John Alexander Greer, Lieutenant Governor of Texas), was land claimed by both Texas and the United States.

The treaty stated that the boundary between the French claims on the north and the Spanish claims on the south was Rio Roxo de Natchitoches (Red River) until it reached the 100th meridian west as noted on John Melish's map published in 1818.

Texas claimed the land south of the North Fork (red on the map) and the United States claimed the land north of the South Fork (blue on the map, later called the Prairie Dog Town Fork Red River).

The dispute resulted in a lawsuit, which was heard by the Supreme Court under its original jurisdiction.

Following that ruling, on May 4, 1896, the land was officially assigned by Congress to Oklahoma Territory.