When Missouri was admitted to the Union, its original border was proposed as an extension of the 36°30′ parallel north that formed the border between Kentucky and Tennessee. That would have excluded the Bootheel. John Hardeman Walker, a pioneer planter in what is now Pemiscot County, argued that the area had more in common with the Mississippi River towns of Cape Girardeau, Ste. Genevieve and St. Louis in Missouri than with its proposed incorporation in the Arkansas Territory. The border was dropped about 50 miles to the 36th parallel north. It follows that parallel about 30 miles until intersecting the St. Francis River, then follows the river back up to about the 36°30′ parallel just west of Campbell, Missouri.