Question: What tribe what American Horse a part of?

full_context: Document 1: Flying Hawk: Flying Hawk (Oglala Lakota: "Čhetáŋ Kiŋyáŋ" in Standard Lakota Orthography; a/k/a Moses Flying Hawk; March 1854 – December 24, 1931) was an Oglala Lakota warrior, historian, educator and philosopher. Flying Hawk's life chronicles the history of the Oglala Lakota people through the 19th and early 20th centuries, as he fought to deflect the worst effects of white rule; educate his people and preserve sacred Oglala Lakota land and heritage. Chief Flying Hawk was a combatant in Red Cloud's War and in nearly all of the fights with the U.S. Army during the Great Sioux War of 1876. He fought alongside his first cousin Crazy Horse and his brothers Kicking Bear and Black Fox II in the Battle of the Little Big Horn in 1876, and was present at the death of Crazy Horse in 1877 and the Wounded Knee Massacre of 1890. Chief Flying Hawk was one of the five warrior cousins who sacrificed blood and flesh for Crazy Horse at the Last Sun Dance of 1877. Chief Flying Hawk is notable in American history for his commentaries and classic accounts of the Battle of the Little Big Horn, Crazy Horse and the Wounded Knee Massacre, and of Native American warriors and statesmen from who fought to protect their families, defend the invasion of their lands and preserve their culture. Chief Flying Hawk was probably the longest standing Wild Wester, traveling for over 30 years throughout the United States and Europe from about 1898 to about 1930. Chief Flying Hawk was an educator and believed public education was essential to preserve Lakota culture. He frequently visited public schools for presentations. Chief Flying Hawk leaves a legacy of Native American philosophy and his winter count covers nearly 150 years of Lakota history.
Document 2: American Horse: American Horse (Oglala Lakota: "Wašíčuŋ Tȟašúŋke" in Standard Lakota Orthography) (a/k/a "American Horse the Younger") (1840 – December 16, 1908) was an Oglala Lakota chief, statesman, educator and historian. American Horse is notable in American history as a U.S. Army Indian Scout and a progressive Oglala Lakota leader who promoted friendly associations with whites and education for his people. American Horse opposed Crazy Horse during the Great Sioux War of 1876-1877 and the Ghost Dance Movement of 1890, and was a Lakota delegate to Washington. American Horse was one of the first Wild Westers with Buffalo Bill’s Wild West and a supporter of the Carlisle Indian Industrial School. “His record as a councillor of his people and his policy in the new situation that confronted them was manly and consistent and he was known for his eloquence."
Document 3: Red Cloud: Red Cloud (Lakota: Maȟpíya Lúta) (1822 – December 10, 1909) was one of the most important leaders of the Oglala Lakota. He led from 1868 to 1909. One of the most capable Native American opponents that the United States Army faced in its mission to subdue the western territories, he led a successful campaign in 1866–1868 known as Red Cloud's War over control of the Powder River Country in northeastern Wyoming and southern Montana. The largest action of the war, the Fetterman Fight (with 81 men killed on the US side), was the worst military defeat suffered by the US on the Great Plains until the Battle of the Little Bighorn ten years later.
Document 4: Little Hawk (Crazy Horse's brother): Little Hawk (1842-1871) is the younger half brother of the famous Oglala warrior Crazy Horse # 3 (1840- 1877). He was the offspring of the remarriage of Worm, Crazy Horse's # 2 widowed father, to a pair of sisters of the Brulé Lakota chief Spotted Tail, Iron Between Horns and Kills Enemy.
Document 5: Little Hawk: Little Hawk (Lakota: Čhetáŋ Čík’ala) (1836–1899) was an Oglala Lakota war chief and a half-brother of Worm, father of Crazy Horse (Lakota: Tashunka-witko).
Document 6: Black Horse (Comanche): Black Horse or Tu-ukumah (unknown–"circa" 1900), was a Comanche war chief. After Bull Bear died in 1874, Black Horse was promoted to second chief in the Quahadi band of Comanche. That is Quanah Parker's band.
Document 7: American Horse (elder): American Horse (Oglala Lakota: "Wašíčuŋ Tȟašúŋke" in Standard Lakota Orthography) (a/k/a "American Horse the Elder") (1830–September 9, 1876) was an Oglala Lakota warrior chief renowned for Spartan courage and honor. American Horse is notable in American history as one of the principal war chiefs allied with Crazy Horse during Red Cloud's War (1866–1868) and the Battle of the Little Bighorn during the Great Sioux War of 1876-1877. Chief American Horse was a son of Old Chief Smoke, an Oglala Lakota head chief and one of the last great Shirt Wearers, a highly prestigious Lakota warrior society. He was a signatory to the Fort Laramie Treaty of 1868, along with his brothers Chief Red Cloud and Chief Blue Horse. A month or so after the Treaty, American Horse was chosen a ""Ogle Tanka Un"" (Shirt Wearer, or war leader) along with Crazy Horse, Young-Man-Afraid-of-His-Horses and Man That Owns a Sword. On September 9, 1876, American Horse was mortally wounded in the Battle of Slim Buttes fighting to protect his family and defending against the white invasion of the "“Paha Sapa“" Black Hills.
Document 8: Red Cloud's War: Red Cloud's War (also referred to as the Bozeman War or the Powder River War) was an armed conflict between the Lakota, Northern Cheyenne, and Northern Arapaho on one side and the United States in Wyoming and Montana territories from 1866 to 1868. The war was fought over control of the western Powder River Country in present north-central Wyoming. This grassland, rich in buffalo, was traditionally Crow Indian land, but the Lakota had recently taken control. The Crow tribe held the treaty right to the disputed area, according to the major agreement reached at Fort Laramie in 1851. All involved in "Red Cloud's War" were parties in that treaty.
Document 9: Captain Jat: Captain Jat is a fictional sea captain created by English writer William Hope Hodgson. Captain Jat was another attempt to create a recurring character, like Hodgson's Captain Gault. Captain Jat is featured in the stories "The Island of the Ud" and "The Adventure of the Headland". Captain Jat himself is a tall, lean man, interested primarily in "treasure and women," who takes cabin boy Pibby Tawles into his confidence. In "The Island of the Ud" their relationship is described as follows:
Document 10: John Wallace Crawford: John Wallace ("Captain Jack)" Crawford (1847–1917), known as "The Poet Scout", was an American adventurer, educator, and author. "Captain Jack" was a master storyteller about the Wild West and is known in American history as one of the most popular performers in the late nineteenth century. His daring ride of 350 miles in six days to carry dispatches to Fort Laramie for the "New York Herald", to tell the news of the great victory by Gen. George Crook against the village of Chief American Horse at the Battle of Slim Buttes during the Great Sioux War of 1876-1877, made him a national celebrity.
Document 11: Treaty of Fort Laramie (1868): The Treaty of Fort Laramie (also called the Sioux Treaty of 1868) was an agreement between the United States and the Oglala, Miniconjou, and Brulé bands of Lakota people, Yanktonai Dakota and Arapaho Nation signed on April 29, 1868 at Fort Laramie in the Wyoming Territory, guaranteeing the Lakota ownership of the Black Hills, and further land and hunting rights in South Dakota, Wyoming, and Montana. The Powder River Country was to be henceforth closed to all whites. The treaty ended Red Cloud's War.
Document 12: William Carver (Wild Bunch): William "News" Carver (September 12, 1868 – April 2, 1901) was an American outlaw and a member of Butch Cassidy's Wild Bunch during the closing years of the American Old West. His nickname "News" was given to him because he enjoyed seeing his name in newspaper stories of his gang's exploits. He was ambushed and killed by Sheriff deputies in 1901.
Document 13: Henry B. Carrington: Henry Beebee Carrington (March 2, 1824 – October 26, 1912) was a lawyer, professor, prolific author, and an officer in the United States Army during the American Civil War and in the Old West during Red Cloud's War. A noted engineer, he constructed a series of forts to protect the Bozeman Trail, but suffered a major defeat at the hands of the warchief Red Cloud.
Document 14: Susan Wallace: Susan Arnold Elston Wallace (December 25, 1830 – October 1, 1907) was an American author and poet from Crawfordsville, Indiana. In addition to writing travel articles for several American magazines and newspapers, Wallace published six books, five of which contain collected essays from her travels in the New Mexico Territory, Europe, and the Middle East in the 1880s: "The Land of the Pueblos" (1888), "The Storied Sea" (1883), "The Repose in Egypt: A Medley" (1888), "Along the Bosphorus, and Other Sketches" (1898), and "The City of the King: What the Child Jesus Saw and Heard" (1903). She was also the wife of Lew Wallace, a lawyer, American Civil War general, politician, and diplomat. Susan completed the manuscript of Lew Wallace's two-volume autobiography following his death in 1905, with the assistance of Mary Hannah Krout, another Crawfordsville author. Wallace died in Crawfordsville in 1907.
Document 15: Kit Carson: Christopher Houston Carson (December 24, 1809 – May 23, 1868), better known as Kit Carson, was an American frontiersman. He was a mountain man (fur trapper), wilderness guide, Indian agent, and U.S. Army officer. Carson became a frontier legend in his own lifetime via biographies and news articles. Exaggerated versions of his exploits were the subject of dime novels.
ground_truth: American Horse (Oglala Lakota: "Wašíčuŋ Tȟašúŋke" in Standard Lakota Orthography) (a/k/a "American Horse the Elder") (1830–September 9, 1876) was an Oglala Lakota warrior chief renowned for Spartan courage and honor.