Historical clue formulations

• Native Nebraskans — 2026-09-20
• Midwestern tribe — 2024-12-07
• Native Americans originally of the Plains — 2021-08-23
• Some Siouan speakers — 2021-01-26
• Tribe that traditionally spoke Chiwere — 2020-10-09
• Plains tribe — 2019-07-09
• Some native Nebraskans — 2017-10-18
• First tribe encountered by Lewis and Clark — 2016-11-24
• Missouri River natives — 2015-12-20
• Tribe once along the Big Blue River — 2015-12-18
• Onetime dwellers along the Big Blue River — 2015-01-23
• Oklahoma tribe — 2014-09-25
• Eagle of Delight's tribe — 2014-04-26
• Winnebago relatives — 2013-09-14
• Some Siouans — 2013-04-07
• Platte River natives — 2013-01-26
• Oklahoma Indians — 2010-01-26
• Nebraska natives — 2010-01-10
• Missouri relatives — 2008-12-26
• Relatives of the Missouria — 2007-12-14
• Oklahoma Indians — 2007-12-04
• Relatives of the Missouria — 2006-05-05
• Plains tribe — 2006-04-09
• Plains natives — 2006-03-04
• Siouan speakers — 2005-05-11
• Siouan tribesmen — 1999-09-26
• Western tribe — 1996-04-27
• Indians whose name means "lovers of sexual pleasure" — 1994-06-09
• Sioux Indians — 1993-12-03