Question: What is the capital of the county where Walnut Grove is contained, in the state where the largest American mass execution occurred?

full_context: Document 1: Red Wing, Minnesota: Red Wing (Formerly Known as Wahcoota) is a city in Goodhue County, Minnesota, United States, along the upper Mississippi River. The population was 16,459 at the 2010 census. It is the county seat of Goodhue County.
Document 2: Capital punishment in the United States: Since 1642 (in the 13 colonies, the United States under the Articles of Confederation, and the current United States) an estimated 364 juvenile offenders have been put to death by the states and the federal government. The earliest known execution of a prisoner for crimes committed as a juvenile was Thomas Graunger in 1642. Twenty-two of the executions occurred after 1976, in seven states. Due to the slow process of appeals, it was highly unusual for a condemned person to be under 18 at the time of execution. The youngest person to be executed in the 20th century was George Stinney, who was electrocuted in South Carolina at the age of 14 on June 16, 1944. The last execution of a juvenile may have been Leonard Shockley, who died in the Maryland gas chamber on April 10, 1959, at the age of 17. No one has been under age 19 at time of execution since at least 1964. Since the reinstatement of the death penalty in 1976, 22 people have been executed for crimes committed under the age of 18. Twenty-one were 17 at the time of the crime. The last person to be executed for a crime committed as a juvenile was Scott Hain on April 3, 2003 in Oklahoma.
Document 3: Capital punishment in the United States: The largest single execution in United States history was the hanging of 38 American Indians convicted of murder and rape during the Dakota War of 1862. They were executed simultaneously on December 26, 1862, in Mankato, Minnesota. A single blow from an axe cut the rope that held the large four-sided platform, and the prisoners (except for one whose rope had broken and who had to be re-hanged) fell to their deaths. The second-largest mass execution was also a hanging: the execution of 13 African-American soldiers for taking part in the Houston Riot of 1917. The largest non-military mass execution occurred in one of the original thirteen colonies in 1723, when 26 convicted pirates were hanged in Newport, Rhode Island by order of the Admiralty Court.
Document 4: Redwood National and State Parks: In 1850, old-growth redwood forest covered more than 2,000,000 acres (8,100 km2) of the California coast. The northern portion of that area, originally inhabited by Native Americans, attracted many lumbermen and others turned gold miners when a minor gold rush brought them to the region. Failing in efforts to strike it rich in gold, these men turned toward harvesting the giant trees for booming development in San Francisco and other places on the West Coast. After many decades of unrestricted clear-cut logging, serious efforts toward conservation began. By the 1920s the work of the Save the Redwoods League, founded in 1918 to preserve remaining old-growth redwoods, resulted in the establishment of Prairie Creek, Del Norte Coast, and Jedediah Smith Redwoods State Parks among others. Redwood National Park was created in 1968, by which time nearly 90% of the original redwood trees had been logged. The National Park Service (NPS) and the California Department of Parks and Recreation (CDPR) administratively combined Redwood National Park with the three abutting Redwood State Parks in 1994 for the purpose of cooperative forest management and stabilization of forests and watersheds as a single unit.The ecosystem of the RNSP preserves a number of threatened animal species such as the tidewater goby, Chinook salmon, northern spotted owl, and Steller's sea lion. In recognition of the rare ecosystem and cultural history found in the parks, the United Nations designated them a World Heritage Site on September 5, 1980 and part of the California Coast Ranges International Biosphere Reserve on June 30, 1983.
Document 5: Redwood County Poor Farm: The Redwood County Poor Farm (or Poorhouse) was a county run institution serving impoverished and aged people in Redwood Falls, Minnesota, United States, from 1884 to 1889 and again from 1909 to 1967, when it was converted to a nursing home.
Document 6: Salem witch trials: The Salem witch trials were a series of hearings and prosecutions of people accused of witchcraft in colonial Massachusetts between February 1692 and May 1693. More than 200 people were accused, nineteen of which were found guilty and executed by hanging (fourteen women and five men). One other man was pressed to death for refusing to plead, and at least five people died in jail. It was the deadliest witch hunt in the history of the United States.
Document 7: Greene County Almshouse: The Greene County Almshouse is a historic poorhouse located in Greene County, Illinois, along a township road northeast of the city of Carrollton. The almshouse was built in 1870 in accordance with an 1839 state law which provided for each county to establish its own almshouse or poor farm for welfare recipients. Prior to passage of the law, public welfare in Illinois had taken the form of "outdoor relief", in which the poor worked on farms in exchange for basic support. Under Illinois' county almshouse system, the poor were intended to receive shelter and necessities in the houses, often in exchange for farm labor on the property. By 1903, all but two of Illinois' counties had established an almshouse or poor farm.
Document 8: Walnut Grove, Minnesota: Walnut Grove is a city in Redwood County, Minnesota, United States. The population was 871 at the 2010 census. Another name formerly associated with the area is Walnut Station.
Document 9: Capital punishment in the United States: All of the executions which have taken place since the 1936 hanging of Bethea in Owensboro have been conducted within a wall or enclosure. For example, Fred Adams was legally hanged in Kennett, Missouri, on April 2, 1937, within a 10-foot (3 m) wooden stockade. Roscoe "Red" Jackson was hanged within a stockade in Galena, Missouri, on May 26, 1937. Two Kentucky hangings were conducted after Galena in which numerous persons were present within a wooden stockade, that of John "Peter" Montjoy in Covington, Kentucky on December 17, 1937, and that of Harold Van Venison in Covington on June 3, 1938. An estimated 400 witnesses were present for the hanging of Lee Simpson in Ryegate, Montana, on December 30, 1939. The execution of Timothy McVeigh on June 11, 2001 was witnessed by some 300 people, some by closed-circuit television.
Document 10: Capital punishment in the United States: Various methods have been used in the history of the American colonies and the United States but only five methods are currently used. Historically, burning, crushing, breaking on wheel, and bludgeoning were used for a small number of executions, while hanging was the most common method. The last person burned at the stake was a black slave in South Carolina in August 1825. The last person to be hanged in chains was a murderer named John Marshall in West Virginia on April 4, 1913. Although beheading was a legal method in Utah from 1851 to 1888, it was never used.
Document 11: Poplar Grove Township, Roseau County, Minnesota: Poplar Grove Township is a township in Roseau County, Minnesota, United States. The population was 80 at the 2000 census.
Document 12: Redwood, Virginia: Redwood is an unincorporated community in Franklin County, Virginia, United States. Redwood is located on Virginia State Route 40 east-northeast of Rocky Mount. Redwood has a post office with ZIP code 24146, which opened on August 9, 1880. zip is incorrect 24092
Document 13: Weedpatch Camp: Between April 1935 and December 1936, the federal government's New Deal Resettlement Administration (RA) had relocated many struggling rural and urban families to planned communities. Weedpatch Camp, however, was constructed by the Works Progress Administration. It was located on the outskirts of the small towns of Arvin and Weedpatch. The camp now is located in an unincorporated area of Kern County just south of Bakersfield.
Document 14: Walnut Grove, Washington: Walnut Grove is a census-designated place (CDP) in Clark County, Washington, United States. The population was 9,790 at the 2010 census, up from 7,164 at the 2000 census.
Document 15: Walnut Grove, Minnesota: Walnut Grove, Minnesota City U.S. Post Office, First State Bank Building, and water tower in Walnut Grove Location of Walnut Grove, Minnesota Coordinates: 44 ° 13 ′ 25 ''N 95 ° 28 ′ 8'' W ﻿ / ﻿ 44.22361 ° N 95.46889 ° W ﻿ / 44.22361; - 95.46889 Coordinates: 44 ° 13 ′ 25 ''N 95 ° 28 ′ 8'' W ﻿ / ﻿ 44.22361 ° N 95.46889 ° W ﻿ / 44.22361; - 95.46889 Country United States State Minnesota County Redwood Founded 1874 Incorporated 1879 Area Total 1.06 sq mi (2.75 km) Land 1.06 sq mi (2.75 km) Water 0 sq mi (0 km) Elevation 1,217 ft (371 m) Population (2010) Total 871 Estimate (2016) 813 Density 820 / sq mi (320 / km) Time zone Central (CST) (UTC - 6) Summer (DST) CDT (UTC - 5) ZIP code 56180 Area code (s) 507 FIPS code 27 - 67846 GNIS feature ID 0653743
ground_truth: Redwood Falls
sub_queries: In what state did the largest American mass execution occur? Answer: Minnesota
Walnut Grove, Minnesota >> located in the administrative territorial entity Answer: Redwood County
Redwood County >> capital Answer: Redwood Falls