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Jackson Purchase. 8,500 sq. mi. area, former tribal lands of Chickasaw Indians. U.S. paid $300,000 for tract in 1818 after negotiations by Gen. Andrew Jackson and Gov. Isaac Shelby. Bordered by Tenn., Ohio and Miss. Rivers. Now comprises Ky.'s 8 and Tenn.'s 20 westernmost counties. Seven identical markers were dedicated at entrances to the Jackson Purchase region on U.S. roadways in 1962. For more information, see ExploreKYHistory: Jackson Purchase