 In 1779–1780, Kentucky's southern border was surveyed and ascertained westward to the Tennessee River.The "Walker line" tended slightly to the north and did not run truly westward along 36 degrees, 30 minutes north (which was the actual border, also called the "Mathews line").Complicating matters, in 1818 Andrew Jackson and Isaac Shelby purchased from the Chickasaw Indian tribe.