Land Cession Archives - Lewis & Clark Research Database https://lewisandclarkresearch.org/treaty-type/land-cession/ A digital archive of treaties, documents, artwork, and 360° trail panoramas from the Corps of Discovery Thu, 20 Aug 2026 16:19:49 +0000 en-US hourly 1 Presidential Proclamation, 1890 (Sioux Act lands opened; Cheyenne River agency tract reserved) https://lewisandclarkresearch.org/treaties/treaty-with-the-cheyenne-river-sioux-1890/ Thu, 19 Feb 2026 13:47:37 +0000 https://research.lewisandclarktrust.org/treaties/treaty-with-the-cheyenne-river-sioux-1890/ Land cession by the Cheyenne River Sioux. Region: Dakota 3. Counties: Stanley. Present-Day Tribes Cheyenne River Sioux Tribe of the Cheyenne River Reservation, South Dakota Citations Tiller 691

The post Presidential Proclamation, 1890 (Sioux Act lands opened; Cheyenne River agency tract reserved) appeared first on Lewis & Clark Research Database.

]]> Land cession by the Cheyenne River Sioux. Region: Dakota 3. Counties: Stanley.

Present-Day Tribes

  • Cheyenne River Sioux Tribe of the Cheyenne River Reservation, South Dakota

Citations

Tiller 691

The post Presidential Proclamation, 1890 (Sioux Act lands opened; Cheyenne River agency tract reserved) appeared first on Lewis & Clark Research Database.

]]> Agreement with the Crow, 1890 (ratified by Act of Mar. 3, 1891) https://lewisandclarkresearch.org/treaties/treaty-with-the-crow-1891/ Thu, 19 Feb 2026 13:47:37 +0000 https://research.lewisandclarktrust.org/treaties/treaty-with-the-crow-1891/ Land cession by the Crow. Region: Montana 2. Counties: Big Horn, Carbon, Stillwater, Treasure, Yellowstone. Present-Day Tribes Crow Tribe of Montana Citations DeMallie 695, 698 Tiller 476

The post Agreement with the Crow, 1890 (ratified by Act of Mar. 3, 1891) appeared first on Lewis & Clark Research Database.

]]> Land cession by the Crow. Region: Montana 2. Counties: Big Horn, Carbon, Stillwater, Treasure, Yellowstone.

Present-Day Tribes

  • Crow Tribe of Montana

Citations

DeMallie 695, 698

Tiller 476

The post Agreement with the Crow, 1890 (ratified by Act of Mar. 3, 1891) appeared first on Lewis & Clark Research Database.

]]> Agreement with the Arikara, Gros Ventre (Hidatsa), and Mandan, 1886 (ratified by Act of Mar. 3, 1891) https://lewisandclarkresearch.org/treaties/treaty-with-the-gros-ventre-and-mandan-1891/ Thu, 19 Feb 2026 13:47:37 +0000 https://research.lewisandclarktrust.org/treaties/treaty-with-the-gros-ventre-and-mandan-1891/ Land cession by the Gros Ventre, Mandan. Region: Dakota 3. Counties: Dunn, McLean, Mercer, Mountrail. Present-Day Tribes Fort Belknap Indian Community of the Fort Belknap Reservation of Montana Three Affiliated…

The post Agreement with the Arikara, Gros Ventre (Hidatsa), and Mandan, 1886 (ratified by Act of Mar. 3, 1891) appeared first on Lewis & Clark Research Database.

]]> Land cession by the Gros Ventre, Mandan. Region: Dakota 3. Counties: Dunn, McLean, Mercer, Mountrail.

Present-Day Tribes

  • Fort Belknap Indian Community of the Fort Belknap Reservation of Montana
  • Three Affiliated Tribes of the Fort Berthold Reservation, North Dakota

Citations

DeMallie 677; Tiller 591

Tiller 481

The post Agreement with the Arikara, Gros Ventre (Hidatsa), and Mandan, 1886 (ratified by Act of Mar. 3, 1891) appeared first on Lewis & Clark Research Database.

]]> Executive Order, 1892 (addition to Fort Berthold Reservation) https://lewisandclarkresearch.org/treaties/treaty-with-the-fort-berthold-reservation-1892/ Thu, 19 Feb 2026 13:47:37 +0000 https://research.lewisandclarktrust.org/treaties/treaty-with-the-fort-berthold-reservation-1892/ Land cession by the Fort Berthold Reservation. Region: Dakota 3. Counties: McLean. Present-Day Tribes Three Affiliated Tribes of the Fort Berthold Reservation, North Dakota Citations Tiller 591

The post Executive Order, 1892 (addition to Fort Berthold Reservation) appeared first on Lewis & Clark Research Database.

]]> Land cession by the Fort Berthold Reservation. Region: Dakota 3. Counties: McLean.

Present-Day Tribes

  • Three Affiliated Tribes of the Fort Berthold Reservation, North Dakota

Citations

Tiller 591

The post Executive Order, 1892 (addition to Fort Berthold Reservation) appeared first on Lewis & Clark Research Database.

]]> Sioux Act of 1889 (Crow Creek) https://lewisandclarkresearch.org/treaties/treaty-with-the-sioux-crow-creek-1889/ Thu, 19 Feb 2026 13:47:36 +0000 https://research.lewisandclarktrust.org/treaties/treaty-with-the-sioux-crow-creek-1889/ Land cession by the Sioux, Crow Creek. Region: Dakota 3. Counties: Buffalo, Hughes, Hyde. Present-Day Tribes Crow Creek Sioux Tribe of the Crow Creek Reservation, South Dakota

The post Sioux Act of 1889 (Crow Creek) appeared first on Lewis & Clark Research Database.

]]> Land cession by the Sioux, Crow Creek. Region: Dakota 3. Counties: Buffalo, Hughes, Hyde.

Present-Day Tribes

  • Crow Creek Sioux Tribe of the Crow Creek Reservation, South Dakota

The post Sioux Act of 1889 (Crow Creek) appeared first on Lewis & Clark Research Database.

]]> Sioux Act of 1889 (Lower Brulé) https://lewisandclarkresearch.org/treaties/treaty-with-the-sioux-lower-brul-1889/ Thu, 19 Feb 2026 13:47:36 +0000 https://research.lewisandclarktrust.org/treaties/treaty-with-the-sioux-lower-brul-1889/ Land cession by the Sioux, Lower Brulé. Region: Dakota 3. Counties: Lyman, Stanley. Present-Day Tribes Lower Brule Sioux Tribe of the Lower Brule Reservation, South Dakota

The post Sioux Act of 1889 (Lower Brulé) appeared first on Lewis & Clark Research Database.

]]> Land cession by the Sioux, Lower Brulé. Region: Dakota 3. Counties: Lyman, Stanley.

Present-Day Tribes

  • Lower Brule Sioux Tribe of the Lower Brule Reservation, South Dakota

The post Sioux Act of 1889 (Lower Brulé) appeared first on Lewis & Clark Research Database.

]]> Sioux Act of 1889 (Pine Ridge) https://lewisandclarkresearch.org/treaties/treaty-with-the-sioux-pine-ridge-1889/ Thu, 19 Feb 2026 13:47:36 +0000 https://research.lewisandclarktrust.org/treaties/treaty-with-the-sioux-pine-ridge-1889/ Land cession by the Sioux, Pine Ridge. Region: Dakota 3, Nebraska. Counties: Bennett, Mellette, Shannon. Present-Day Tribes Oglala Sioux Tribe of the Pine Ridge Reservation, South Dakota

The post Sioux Act of 1889 (Pine Ridge) appeared first on Lewis & Clark Research Database.

]]> Land cession by the Sioux, Pine Ridge. Region: Dakota 3, Nebraska. Counties: Bennett, Mellette, Shannon.

Present-Day Tribes

  • Oglala Sioux Tribe of the Pine Ridge Reservation, South Dakota

The post Sioux Act of 1889 (Pine Ridge) appeared first on Lewis & Clark Research Database.

]]> Sioux Act of 1889 (Rosebud) https://lewisandclarkresearch.org/treaties/treaty-with-the-sioux-rosebud-1889/ Thu, 19 Feb 2026 13:47:36 +0000 https://research.lewisandclarktrust.org/treaties/treaty-with-the-sioux-rosebud-1889/ Land cession by the Sioux, Rosebud. Region: Dakota 3. Counties: Bennett, Gregory, Mellette, Todd, Tripp. Present-Day Tribes Rosebud Sioux Tribe of the Rosebud Indian Reservation, South Dakota

The post Sioux Act of 1889 (Rosebud) appeared first on Lewis & Clark Research Database.

]]> Land cession by the Sioux, Rosebud. Region: Dakota 3. Counties: Bennett, Gregory, Mellette, Todd, Tripp.

Present-Day Tribes

  • Rosebud Sioux Tribe of the Rosebud Indian Reservation, South Dakota

The post Sioux Act of 1889 (Rosebud) appeared first on Lewis & Clark Research Database.

]]> Sioux Act of 1889 (Standing Rock) https://lewisandclarkresearch.org/treaties/treaty-with-the-sioux-standing-rock-1889/ Thu, 19 Feb 2026 13:47:36 +0000 https://research.lewisandclarktrust.org/treaties/treaty-with-the-sioux-standing-rock-1889/ Land cession by the Sioux, Standing Rock. Region: Dakota 3. Counties: Corson, Grant, Perkins, Sioux. Present-Day Tribes Standing Rock Sioux Tribe of North & South Dakota

The post Sioux Act of 1889 (Standing Rock) appeared first on Lewis & Clark Research Database.

]]> Land cession by the Sioux, Standing Rock. Region: Dakota 3. Counties: Corson, Grant, Perkins, Sioux.

Present-Day Tribes

  • Standing Rock Sioux Tribe of North & South Dakota

The post Sioux Act of 1889 (Standing Rock) appeared first on Lewis & Clark Research Database.

]]> Agreement with the Indians of Fort Belknap Agency, 1886-87 (ratified by Act of May 1, 1888) https://lewisandclarkresearch.org/treaties/treaty-with-the-indians-of-fort-belknap-agency-1888/ Thu, 19 Feb 2026 13:47:35 +0000 https://research.lewisandclarktrust.org/treaties/treaty-with-the-indians-of-fort-belknap-agency-1888/ Land cession by the Indians of Fort Belknap agency. Region: Montana 2. Counties: Blaine, Phillips. Present-Day Tribes Fort Belknap Indian Community of the Fort Belknap Reservation of Montana Citations Tiller…

The post Agreement with the Indians of Fort Belknap Agency, 1886-87 (ratified by Act of May 1, 1888) appeared first on Lewis & Clark Research Database.

]]> Land cession by the Indians of Fort Belknap agency. Region: Montana 2. Counties: Blaine, Phillips.

Present-Day Tribes

  • Fort Belknap Indian Community of the Fort Belknap Reservation of Montana

Citations

Tiller 481

The post Agreement with the Indians of Fort Belknap Agency, 1886-87 (ratified by Act of May 1, 1888) appeared first on Lewis & Clark Research Database.

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