Question: King of Cars was an American reality television series, centering on the Towbin Dodge car dealership, in Henderson, officially the City of Henderson, is a city in Clark County, Nevada, in which country?

Context paragraphs:
Ellen Spiegel: Ellen B. Spiegel, (born in 1962 in New York City, New York), is an American politician who is a Democratic member of the Nevada Assembly, first elected November 4, 2008 representing District 21 in Henderson, and since November 6, 2012 representing District 20, which is split between Henderson and unincorporated Clark County.  Spiegel has lived in Henderson, Nevada's second-largest city, since 2001.  Spiegel is a small-business owner, a Board member of Easter Seals Nevada, and the winner of awards from organizations including the March of Dimes, the Urban Chamber of Commerce, the Nevada Women's Lobby, and others.  Spiegel was Assistant Majority Whip in the 79th Legislative Session (2017), and is one of fewer than twenty Democratic Party women to ever hold an Assembly leadership position in Nevada.  She also is on the Board of Directors of the bipartisan National Association of Jewish Legislators, where she is Secretary, and chairs the bipartisan Nevada Jewish Legislative Council.

Ara Celi: Ara Celi (born May 31, 1974) is an American actress active in American film and television.  She had a starring role in the minor 1997 dance movie "Looking for Lola," but she is probably best known for her role as Ampata Gutierrez aka "Inca Mummy Girl" from season two of "Buffy the Vampire Slayer".  She is now most often seen in television advertisements for Universal Toyota car dealership in San Antonio, Texas and Charles Maund Toyota dealership in Austin, Texas and Boggus Ford dealership in McAllen, Texas.

Manhattan Motorcars: Manhattan Motorcars is a New York City mega luxury car dealership.  It is the only official Lamborghini, Bentley, Rolls-Royce, Spyker Cars, Porsche, Bugatti and Lotus dealership in NYC.  It is located at 270 Eleventh Avenue in a building belonging to Michael Dezer, a noted real estate developer and car collector.

Joe Hardy (politician): Joseph "Joe" Paul Hardy (born May 15, 1949) is a Republican member of the Nevada Senate, representing District 12.  Hardy was first elected to the Senate in 2010 when, before redistricting and a change in the nomenclature of the districts, he represented Clark County Number 12.  His district represents rural areas of southeast Clark County including the communities of Boulder City, Laughlin, Searchlight, Henderson, Overton, Bunkerville, Mesquite, as well as Nellis Air Force Base, Lake Mead, and Valley of Fire State Park.  Hardy previously represented Clark County District 20 from 2002 to 2010.

King of Cars: King of Cars was an American reality television series, centering on the Towbin Dodge car dealership, in Henderson, Nevada, south of Las Vegas, Nevada.  Managed by Josh Towbin a.k.a. "Chop" a.k.a. the "King of Cars", famous for the cult hit infomercial, "The Chopper Show", in which his salesmen dress up as various characters, as he "chops" the prices of his cars.

Family Trade: Family Trade is an American reality television series broadcast by Game Show Network.  The show premiered on March 12, 2013, and continued to air new episodes until April 16, 2013.  Filmed in Middlebury, Vermont, the series chronicles the daily activities of G. Stone Motors, a GMC and Ford car dealership that employs the barter system in selling its automobiles.  The dealership is operated by its founder, Gardner Stone, his son and daughter, Todd and Darcy, and General Manager Travis Romano.  The series features the shop's daily interaction with its customers, who bring in a variety of items that can be resold in order to receive a down payment on the vehicle they are leasing or purchasing.  Commentary and narration are also often provided by the Stones during the episodes.

Henderson Executive Airport: Henderson Executive Airport (IATA: HSH, ICAO: KHND, FAA LID: HND) is a public airport located 11 NM south of the central business district of Las Vegas, in Clark County, Nevada, United States.  The airport is owned by Clark County and operated by the Clark County Department of Aviation.  According to the FAA's National Plan of Integrated Airport Systems for 2009-2013, it is categorized as a "reliever airport".  It was originally known as Sky Harbor Airport, but was renamed in 1996 when it was purchased by Clark County to be used as a reliever airport for McCarran International Airport.

Henderson, Nevada: Henderson, officially the City of Henderson, is a city in Clark County, Nevada, United States, about 16 miles southeast of Las Vegas.  It is the second-largest city in Nevada, after Las Vegas, with an estimated population of 292,969 in 2016.  The city is part of the Las Vegas metropolitan area, which spans the entire Las Vegas Valley.  Henderson occupies the southeastern end of the valley, at an elevation of approximately 1330 ft .

Sheriff of Clark County: Sheriff of Clark County, officially The Sheriff of the County of Clark, is the chief law enforcement officer of Clark County, Nevada.  The sheriff heads the Las Vegas Metropolitan Police Department, which has joint jurisdiction within the City of Las Vegas and Clark County.  The sheriff is the only elected head law enforcement officer within the city and county, and, as such, is not under the direct control of the city or county government.

Las Vegas–Paradise, NV MSA: The Las Vegas–Paradise, NV MSA, also known as the Las Vegas–Henderson–Paradise, NV Metropolitan Statistical Area (2013), is in the southern part of the U.S. state of Nevada, coextensive since 2003 with Clark County, Nevada.  A central part of the metropolitan area is the Las Vegas Valley, a 600 sqmi basin that includes the metropolitan area's largest city, Las Vegas as well as the other primary city, Paradise, Nevada.  The area contains the largest concentration of people in the state.  Cities in the metropolitan area include Las Vegas, Henderson, North Las Vegas, and Boulder City.  The metropolitan area is one of the top tourist destinations in the world, drawing over 40 million international and domestic visitors in 2013 with a GMP of US$103.3 billion.

Supporting paragraphs: King of Cars Henderson, Nevada
Answer: United States