Question: Shady Grove, in the state where the first caucus is held for each presidential campaign, is located in what county?

full_context: Document 1: 2004 United States presidential election: In March's Super Tuesday, Kerry won decisive victories in the California, Connecticut, Georgia, Maryland, Massachusetts, New York, Ohio, and Rhode Island primaries and the Minnesota caucuses. Dean, despite having withdrawn from the race two weeks earlier, won his home state of Vermont. Edwards finished only slightly behind Kerry in Georgia, but, failing to win a single state other than South Carolina, chose to withdraw from the presidential race. Sharpton followed suit a couple weeks later. Kuninch did not leave the race officially until July.
Document 2: 2004 United States presidential election: By the January 2004 Iowa caucuses, the field had dwindled down to nine candidates, as Bob Graham had dropped out of the race. Howard Dean was a strong front-runner. However, the Iowa caucuses yielded unexpectedly strong results for Democratic candidates John Kerry, who earned 38% of the state's delegates and John Edwards, who took 32%. Former front-runner Howard Dean slipped to 18% and third place, and Richard Gephardt finished fourth (11%). In the days leading up to the Iowa vote, there was much negative campaigning between the Dean and Gephardt camps.
Document 3: Shady Grove, Trousdale County, Tennessee: Shady Grove is an unincorporated community in Trousdale County, Tennessee, United States. Shady Grove is southeast of downtown Hartsville. As Hartsville and Trousdale County form a consolidated city-county government, Shady Grove is under the jurisdiction of Hartsville.
Document 4: Island Grove Township, Gage County, Nebraska: Island Grove Township is one of twenty-four townships in Gage County, Nebraska, United States. The population was 103 at the 2000 census. A 2006 estimate placed the township's population at 103.
Document 5: Liberty Grove, Delta County, Texas: Liberty Grove is a ghost town in Delta County, Texas, United States. The community was settled by 1854, the year its school opened. The farming community included the school and a cemetery as of 1936. In 1966, the community had approximately 25 residents. The community's cemetery was relocated in 1989, and the community was subsequently abandoned and flooded by Cooper Lake. A campsite in Cooper Lake State Park bears the community's name.
Document 6: Shady Grove, Iowa: Shady Grove is a former townsite and unincorporated community in Buchanan County, Iowa, United States, between the cities of Brandon and Jesup. Settlement of Shady Grove began in 1857, but with the advent of rural migration, the population had dropped to 25 by the 1950s. New housing developments begun during the 1990s and 2000s, however, have caused the empty community to be reborn, causing controversy along the way.
Document 7: Balltown, Iowa: Balltown is a city in Dubuque County, Iowa, United States. It is part of the Dubuque, Iowa Metropolitan Statistical Area. The population was 68 at the 2010 census, down from 73 at the 2000 census. Balltown is home to Breitbach's Country Dining, Iowa's oldest restaurant and bar, which was founded in 1852 and twice rebuilt by the community, following its destruction by fire in 2007 and 2008.
Document 8: Bear Grove Township, Guthrie County, Iowa: Bear Grove Township is one of seventeen townships in Guthrie County, Iowa, United States. It is located WSW of Guthrie Center just west of Sutcliff Woodland. As of the 2010 census, its population was 160.
Document 9: 2020 United States presidential election: The United States presidential election of 2020, scheduled for Tuesday, November 3, 2020, will be the 59th quadrennial U.S. presidential election. Voters will select presidential electors who in turn will either elect a new president and vice president through the electoral college or re-elect the incumbents. The series of presidential primary elections and caucuses are likely to be held during the first six months of 2020. This nominating process is also an indirect election, where voters cast ballots selecting a slate of delegates to a political party's nominating convention, who then in turn elect their party's presidential nominee.
Document 10: 2004 United States presidential election: The following week, John Edwards won the South Carolina primary and finished a strong second in Oklahoma to Clark. Lieberman dropped out of the campaign the following day. Kerry dominated throughout February and his support quickly snowballed as he won caucuses and primaries, taking in a string of wins in Michigan, Washington, Maine, Tennessee, Washington, D.C., Nevada, Wisconsin, Utah, Hawaii, and Idaho. Clark and Dean dropped out during this time, leaving Edwards as the only real threat to Kerry. Kucinich and Sharpton continued to run despite poor results at the polls.
Document 11: Shady Grove, McIntosh County, Oklahoma: Shady Grove is a census-designated place (CDP) in McIntosh County, Oklahoma, United States. The population was 199 at the 2010 census, a decrease of 14.4 percent from 229 in 2000.
Document 12: United States presidential primary: Delegates to the national convention were usually selected at state conventions whose own delegates were chosen by district conventions. Sometimes they were dominated by intrigue between political bosses who controlled delegates; the national convention was far from democratic or transparent. Progressive Era reformers looked to the primary election as a way to measure popular opinion of candidates, as opposed to the opinion of the bosses. Florida enacted the first presidential primary in 1901. The Wisconsin direct open primary of 1905 was the first to eliminate the caucus and mandate direct selection of national convention delegates. In 1910, Oregon became the first state to establish a presidential preference primary, which requires delegates to the National Convention to support the winner of the primary at the convention. By 1912, twelve states either selected delegates in primaries, used a preferential primary, or both. By 1920 there were 20 states with primaries, but some went back, and from 1936 to 1968, 12 states used them.
Document 13: Interregional Primary Plan: The Interregional Primary Plan is a proposed reform to the United States primary calendar supported by Representative Sandy Levin and Senator Bill Nelson, both Democrats. The plan would break the country into six regions. From those regions, one subregion - either a single state or a group of smaller states - would vote on each primary date (e.g., all A states,) with the entire country having held its primaries after the sixth set of primaries votes. Each state would vote first once every twenty-four years, with the first set of primaries determined by lottery and cycled thereafter.
Document 14: United States presidential primary: February 1: Iowa caucus (both parties) February 9: New Hampshire primary (both parties) February 20: Nevada Democratic caucuses and South Carolina Republican primary February 23: Nevada Republican caucuses February 27: South Carolina Democratic primary March 1: Super Tuesday: Primaries / caucuses for both parties in several states
Document 15: South Grove Township, DeKalb County, Illinois: South Grove Township is one of nineteen townships in DeKalb County, Illinois, USA. As of the 2010 census, its population was 512 and it contained 209 housing units. South Grove Township was renamed from Vernon Township on November 20, 1850.
ground_truth: Buchanan County
sub_queries: where is the first caucus held for each presidential campaign Answer: Iowa
Shady Grove, Iowa >> located in the administrative territorial entity Answer: Buchanan County