Related Clues:

• Siouan language
• Noted Big Apple residence, with 'the'
• See 42-Across
• Sitting Bull, e.g.
• Crazy Horse, e.g.
• Crazy Horse's people
• Nebraska natives
• Plains people
• Crazy Horse, for one
• Word with North or South
• Siouan people
• Sitting Bull was one
• U.S. territory until 1889
• John Lennon's last home
• Plains Indians