Question: Clay County is a county located in the U.S. state of South Dakota, the county is named in honor of Henry Clay, an American lawyer and planter, statesman, and skilled orator who represented which state,in both the United States Senate and House of Representatives?

Context paragraphs:
Henry Clay: Henry Clay Sr. (April 12, 1777 – June 29, 1852) was an American lawyer and planter, statesman, and skilled orator who represented Kentucky in both the United States Senate and House of Representatives.  After serving three non-consecutive terms as Speaker of the House of Representatives, Clay helped elect John Quincy Adams as president, and Adams subsequently appointed Clay as Secretary of State.  Clay served four separate terms in the Senate, including a stints from 1831 to 1842 and from 1849 to 1852.  He ran for the presidency in 1824, 1832 and 1844, and unsuccessfully sought his party's nomination in 1840 and 1848.  Clay was one of a handful of central national leaders from 1811 to the 1850s, defining the issues, proposing nationalistic solutions, and creating the Whig Party, one of the two major parties during the Second Party System.

Clay County, Kentucky: Clay County is a county located in the U.S. state of Kentucky.  As of the 2010 census, the population was 21,730.  Its county seat is Manchester.  The county was formed in 1807 and named in honor of Green Clay (1757–1826).  Clay was a member of the Virginia and Kentucky State legislatures, first cousin once removed of Henry Clay, U.S. Senator from Kentucky and Secretary of State in the 19th century.

Clay County, Alabama: Clay County is a county of the U.S. state of Alabama.  As of the 2010 census the population was 13,932.  Its county seat is Ashland.  Its name is in honor of Henry Clay, famous American statesman, member of the United States Senate from Kentucky and United States Secretary of State in the 19th century.  It was the last dry county in Alabama with no wet cities within its boundaries, until a vote on March 1, 2016 approved the sale of alcohol in Lineville and Ashland.

Clay County, Missouri: Clay County is a county located in the U.S. state of Missouri.  As of the 2010 census, the county had a population of 221,939, making it the fifth-most populous county in Missouri.  Its county seat is Liberty.  The county was organized January 2, 1822, and named in honor of U.S. Representative Henry Clay from Kentucky, later member of the United States Senate and United States Secretary of State.

Clay County, Mississippi: Clay County is a county located in the U.S. state of Mississippi.  As of the 2010 census, the population was 20,634.  Its county seat is West Point.  Its name is in honor of American statesman Henry Clay, member of the United States Senate from Kentucky and United States Secretary of State in the 19th century.

Clay County, South Dakota: Clay County is a county located in the U.S. state of South Dakota.  As of the 2010 census, the population was 13,864.  The county seat is Vermillion, which is also home to the University of South Dakota.  The county is named in honor of Henry Clay, American statesman, member of the United States Senate from Kentucky and United States Secretary of State in the 19th century.

Clay County, Iowa: Clay County is a county located in the U.S. state of Iowa.  As of the 2010 census, the population was 16,667.  Its county seat is Spencer.  Its name is in honor of Henry Clay, Jr., a colonel who died in action in the Mexican-American War, and son of Henry Clay, famous American statesman.

Clay County, Minnesota: Clay County is a county located in the U.S. state of Minnesota.  As of the 2010 census, the population was 58,999.  Its county seat is Moorhead.  The county's name is in honor of American statesman Henry Clay, member of the United States Senate from Kentucky and United States Secretary of State in the 19th century.  The county was formed in 1862 and organized in 1872.  It was originally called Breckenridge County, but changed to its current name in 1862.

Clay County, West Virginia: Clay County is a county in the U.S. state of West Virginia.  As of the 2010 census, the population was 9,386.  Its county seat is Clay.  The county was founded in 1858 and named in honor of Henry Clay, famous American statesman, member of the United States Senate from Kentucky and United States Secretary of State in the 19th century.

Clay County, Tennessee: Clay County is a county located in the U.S. state of Tennessee.  As of the 2010 census, the population was 7,861.  Its county seat and only incorporated city is Celina.  Clay County is named in honor of American statesman Henry Clay, member of the United States Senate from Kentucky and United States Secretary of State in the 19th century.  Its current mayor is Dale Reagan.

Supporting paragraphs: Clay County, South Dakota Henry Clay
Answer: Kentucky