Historical clue formulations

• Central Plains people — 2026-09-17
• Plains people — 2026-07-25
• Midwestern native — 2026-04-01
• Great Plains tribe — 2026-03-17
• Great Plains native — 2025-11-19
• Central Plains tribe — 2025-10-07
• Great Plains tribe — 2025-07-13
• Central Plains tribe — 2025-05-06
• Tribe headquartered in Red Rock, Okla. — 2025-03-30
• Tribe along the Missouri River — 2025-02-09
• ___-Missouria Tribe — 2025-02-01
• Great Plains tribe — 2024-11-18
• Siouan tribe — 2024-04-30
• Plains tribe — 2024-01-31
• Tribe related to the Missouri — 2024-01-12
• Great Plains tribe — 2023-12-18
• Central Plains tribe — 2023-11-15
• Plains people — 2023-09-27
• Midwest tribe — 2023-09-15
• Great Plains people — 2023-09-06
• Platte Valley people — 2023-09-02
• ___-Missouria Tribe — 2023-07-02
• Great Plains tribe — 2023-05-15
• Siouan people — 2022-12-25
• Chiwere-speaking tribe — 2022-10-23
• Great Plains tribe — 2022-08-01
• First Native American tribe to meet with Lewis and Clark — 2022-02-16
• Plains tribe — 2022-01-19
• Siouan people — 2021-10-18
• Great Plains tribe — 2021-10-08
• Nebraska native — 2021-08-09
• Great Plains people — 2021-06-18
• Tribe that lent its name to a Nebraska county — 2020-12-29
• Omaha relative — 2020-10-23
• Native speakers of Chiwere — 2020-10-04
• Onetime buffalo-hunting tribe — 2020-02-19
• Nebraska county named for an indigenous people — 2019-12-25
• Neighbors of the Omaha — 2019-09-27
• Great Plains tribe — 2019-07-03
• Great Plains tribe — 2019-05-20
• Nebraska native tribe — 2019-02-04
• Siouan people — 2018-10-16
• Tribe at Council Bluff — 2018-08-28
• Tribe encountered by Lewis and Clark — 2018-07-06
• Early tribe met by Lewis and Clark — 2018-03-07
• Plains Indian — 2018-02-06
• Plains tribe — 2017-11-13
• Great Plains tribe — 2017-02-01
• Western tribe — 2016-12-04
• Some Great Plains residents — 2016-11-27