Question: What tribe what American Horse a part of?
Related documents: [0]  [DOC] 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. [END] 
[1]  [DOC] 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. [END] 
Answer: 
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 (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.