Treaty of Fort Harmar
Treaty of Greenville
Treaty of St. Louis (1804)
Treaty of Portage des Sioux
Treaty of St. Louis (1816)
Treaty of St. Louis (1822)
Treaty of Washington
First Treaty of Prairie du Chien
Fourth Treaty of Prairie du Chien
1832 Treaty
September 27, 1836 Treaty
September 28, 1836 Treaty
September 28, 1836 Treaty
1837 Treaty
1837 Treaty
1842 Treaty
1854 Treaty (Missouri Sac and Fox)
1859 Treaty
1861 Treaty (Iowa Sac and Fox)
Feb 18th, 1867
June 10, 1872 "Act of Congress" (Missouri Sac and Fox)
Feb 13th, 1891 "Act of Congress"

Clan system
The Sauk and Fox peoples were divided into two moieties or "divisions", which in turn were subdivided into Patri-lineages and Clans as local subgroups (segments). The moieties were known as the Kishko/Ki-sko-ha/Kîshkôha (male: Kîshkôha, female: Kîshkôhkwêha) ("the long-haired") and as the Oskush/Askasa/Shkasha (male: Shkasha/Oshkashîwiwa, female: Shkashîhkwêwa/Oshkashîhkwêwiwa) ("the brave"). The two moieties were each symbolized by two colors: The Askasa/Shkasha painted their faces and partly their bodies with charcoal in mahkatêwâwi (black) and the Ki-sko-ha/Kîshkôha painted their bodies with white clay in wâpeshkyâwi (white). This duality was also celebrated by the two moieties in Lacrosse, which was often played extremely brutally to toughen young warriors for combat, for recreation, as part of festivals, and used as preparation for imminent wars or raids. This division has survived to the present day, but is now more related to the political system of the United States: the supporters of the Democratic Party are associated with the Kîshkôha/Kîshkôhkwêha, while the supporters of the Republican Party are associated with the Shkasha/Shkashîhkwêwa.
A smaller number returned to the Midwest from Oklahoma (or resisted leaving.) They joined the Mesquakie at the Mesqwaki Settlement, Iowa. The land currently occupied by the Sauk is only a section of what used to be the Sac and Fox Reservation during the time of 1867–1891. This reservation was established by the U.S. and spanned 480,000 acres. In 1887, however, the Dawes Act failed to recognize Native American culture by dividing the reservation into small allotments designated for individual households. The remainder of land not allotted to the Sac and Fox was then sold to non-Native settlers in an attempt to gain Oklahoma statehood and the full assimilation of its Native American population. By 1889, 519 of the tribe were located in Indian Territory, what is now central Oklahoma. On June 10, 1890, they ceded these Indian Territory lands to the federal government. Treaties with U.S. Many of the latter treaties listed have little to no information regarding their details, besides the date. In total, twenty two treaties were signed from 1789 to, more than a century later, 1891.