Question: Where did the man who killed twenty California Indians establish a fort?

full_context: Document 1: Marais des Cygnes massacre: The Marais des Cygnes massacre ( , , or ) is considered the last significant act of violence in Bleeding Kansas prior to the outbreak of the American Civil War. On May 19, 1858, approximately 30 men led by Charles Hamilton, a Georgian native and proslavery leader, crossed into the Kansas Territory from Missouri. They arrived at Trading Post, Kansas, in the morning and then headed back to Missouri. Along the way they captured 11 Free-Staters, none of whom were armed and, it is said, none of whom had participated in the ongoing violence. Most of the men knew Hamilton and apparently did not realize he meant them harm. These prisoners were led into a defile, where Hamilton ordered the men to shoot. He even shot and fired the first bullet himself. Five men were killed.
Document 2: Centralia Massacre (Missouri): The Centralia Massacre was an incident during the American Civil War in which twenty-four unarmed Union soldiers were captured and executed at Centralia, Missouri on September 27, 1864 by the pro-Confederate guerrilla leader William T. Anderson. Future outlaw Jesse James was among the guerrillas.
Document 3: Kern and Sutter massacres: The Kern and Sutter massacres refer to a campaign of terrorism on March 23, 1847 in which men led by Captain Edward M. Kern and rancher John Sutter killed twenty California Indians.
Document 4: Sutter General Hospital: Sutter General Hospital, part of the Sutter Health network, is located in midtown, Sacramento next to the historic Sutter's Fort State Park. It is also directly adjacent to the Capital City Freeway (Business Route 80). The hospital is housed in a five-story building. It is one of two acute-care hospitals that are part of Sutter Medical Center, Sacramento, which also consists of Sutter Memorial Hospital, which is located just 2 miles away in East Sacramento and has been called "the baby hospital" because more than 300,000 babies have been born there. Sutter General Hospital has 306 beds. The hospital focuses on general acute medical/surgical care as well as a medical base to advanced services for cancer, orthopedics, spine, and neurology and neurosurgery. Sutter Memorial Hospital houses cardiac care. Sutter Medical Center, Sacramento is currently undergoing a major expansion which is detailed here: Sutter Hospital Expansion.
Document 5: Whitman massacre: The Whitman massacre (also known as the Walla Walla massacre and the Whitman Incident) was the murder of Oregon missionaries Marcus Whitman and his wife Narcissa, along with eleven others, on November 29, 1847. They were killed by a party of Cayuse Native Americans who accused him of having poisoned 200 Cayuse in his medical care. The incident began the Cayuse War. It took place in present-day southeastern Washington state, near the town of Walla Walla, and was one of the most notorious episodes in the U.S. settlement of the Pacific Northwest. The event was the climax of several years of complex interaction between Whitman, who had helped lead the first wagon train to cross Oregon's Blue Mountains and reach the Columbia River via the Oregon Trail, his wife and fellow missionary Narcissa, and the local Native Americans. The story of the massacre shocked the United States Congress into action concerning the future territorial status of the Oregon Country. The Oregon Territory was established on August 14, 1848.
Document 6: Sutter Medical Center: Sutter Medical Center, Sacramento is a medical center in Sacramento, California that has been named one of the Top 100 Hospitals in the nation for five years, including 2013-2015. It is owned and operated by Sutter Health, a Northern California not-for-profit health system. Sutter Medical Center, Sacramento offers both community-based and tertiary medical services. In 2015, Sutter Medical Center, Sacramento (SMCS) consolidated its Sutter Memorial Hospital campus in East Sacramento with its midtown Sutter General Hospital location, with the opening of the Anderson Lucchetti Women's and Children's Center and the complete remodeling of Sutter General Hospital into the Ose Adams Medical Pavilion. The midtown location is where Sutter Health's first hospital, Sutter Hospital, opened in 1923. Sutter Medical
Document 7: Clark massacre: In August, 1851, a band of Shoshoni Indians led by Cho Cho Co (also called Has No Horse) reportedly attacked a wagon train led by Thomas Clark on the Oregon Trail near where the Raft River joins the Snake River in present-day Idaho. Afterward, reports held that the Indians' primary objective was to steal horses from Thomas Clark's wagon train party, and that the Indians killed Clark's mother and brother and another man traveling with them during the horse robbery.
Document 8: John Jacob Astor: John Jacob Astor (July 17, 1763 – March 29, 1848) (born Johann Jakob Astor) was a German–American businessman, merchant, real estate mogul and investor who mainly made his fortune in fur trade and by investing in real estate in or around New York City.
Document 9: John M. Rowan: John M. Rowan was born May 17, 1829 in Craig County, Virginia. When he was about sixteen years old he came to Gap Mills, West Virginia to work as a clerk for Andrew Summers. He worked there for several years until the California Gold Rush in 1849. After receiving word about this new opportunity he joined in partnership with several other man and purchased a ship at Richmond, Virginia. The ship was provisioned for two years and then set on its journey around Cape Horn and to California. It was here that John had a fair amount of success with his gold hunting. After his successful time in California he returned to Gap Mills where he married Virginia Summers in 1855. On April 23, 1857, Virginia gave birth to a son, Andrew Summers Rowan, who was named for her father. In 1860 and 1862 he was elected to the Virginia House of Delegates. He became a Democratic member of the West Virginia House of Delegates, serving as Speaker of the House from 1887-1889. In 1891 he was appointed to the newly created state board of agriculture and from 1892-1896 served as State Treasurer. In 1904, he was a delegate to the Democratic National Convention.
Document 10: Native Sons of the Golden West: The Native Sons of the Golden West is a fraternal service organization founded in 1875, limited to native born Californians and dedicated to historic preservation, documentation of historic structures and places in the state, the placement of historic plaques and other charitable functions within California. In 1890 they placed the first historical marker in the state to honor the discovery of gold which gave rise to the state nickname "Golden State" and "Golden West." Former U.S. President Richard M. Nixon and former Chief Justice of the United States Earl Warren were both past presidents of the NSGW.
Document 11: Mendocino War: The Mendocino War was a violent conflict from July 1859 to January 18, 1860, between white settlers and local natives (mainly Yuki tribes) in Mendocino County, California. It was caused by settler intrusion and slave raids on native lands and subsequent native retaliation, resulting in the deaths of hundreds of natives. In 1859, a band of locally sponsored rangers led by Walter S. Jarboe, called the Eel River Rangers, raided the countryside in an effort to remove natives from settler territory and move them onto the Nome Cult Farm, an area near the Mendocino Indian Reservation. By the time the Eel River Rangers were disbanded in 1860, Jarboe and his men had killed 283 warriors, captured 292, killed countless women and children, and only suffered 5 casualties themselves in just 23 engagements. The bill to the state for the rangers’ services amounted to $11,143.43. Scholars, however, state that the damage to the area and natives in particular was even higher than reported, especially given the vast number of raiding parties formed outside of the Eel River Rangers. Frustrated with the inadequacy of federal protection, settlers formed their own raiding parties against the natives, joining Jarboe in his mission to rid Round Valley of its native population. Those that survived were moved to the Nome Cult Farm, where they experienced hardships typical of the reservation system of the day. After the conflict, contemporaries claimed that the conflict was more of a slaughter than a war, and later historians have labeled it a genocide.
Document 12: California Gold Rush: The California Gold Rush (1848–1855) began on January 24, 1848, when gold was found by James W. Marshall at Sutter's Mill in Coloma, California. The news of gold brought some 300,000 people to California from the rest of the United States and abroad. The sudden influx of immigration and gold into the money supply reinvigorated the American economy, and California became one of the few American states to go directly to statehood without first being a territory, in the Compromise of 1850. The Gold Rush initiated the California Genocide, with 100,000 Native Californians dying between 1848 and 1868. By the time it ended, California had gone from a thinly populated ex-Mexican territory to the home state of the first nominee for the Republican Party.
Document 13: List of Indian massacres: In the history of the European colonization of North America, an atrocity termed "Indian massacre" is a specific incident wherein a group of people (military, mob or other) deliberately kill a significant number of relatively defenseless or innocent people—usually civilian noncombatants or to the summary execution of prisoners-of-war. The term refers to the killings of Euro-Americans by Native Americans (Indians) as well as to killings of Native Americans by Euro-Americans and/or by other Native Americans.
Document 14: James W. Marshall House: The James W. Marshall House, located at 60 Bridge Street in Lambertville, Hunterdon County, New Jersey, United States, was the boyhood home of James W. Marshall. Marshall's discovery of gold in the American River in California in January 1848 set the stage for the California Gold Rush. It is currently the headquarters of the Lambertville Historical Society.
Document 15: John Sutter: John Augustus Sutter (February 20, 1803 – June 18, 1880), born Johann August Suter, was a German-born Swiss pioneer of California known for establishing Sutter's Fort in the area that would eventually become Sacramento, California, the state's capital. Although he became famous following the discovery of gold by his employee James W. Marshall and the mill making team at Sutter's Mill, Sutter saw his own business ventures fail during the California Gold Rush. Those of his elder son, John Augustus Sutter Jr., were more successful.
ground_truth: Sacramento, California,