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.
Federally recognized tribes
Today the federally recognized Sac and Fox tribes are:

Sac and Fox Nation (Meskwaki: Othâkîwaki, meaning: "People of the yellow earth"), headquartered in Stroud, Oklahoma;
Sac and Fox Tribe of the Mississippi in Iowa (Meskwaki: Meshkwahkîhaki, meaning: "People of the red earth"), headquartered in Tama, Iowa; and
Sac and Fox Nation of Missouri in Kansas and Nebraska (Meskwaki: Nîmahâhaki), headquartered in Reserve, Kansas. Language
Sauk is a dialect of the Fox language, one of the many Algonquian languages. It is very closely related to the dialects spoken by the Meskwaki and the Kickapoo tribes. Each of the dialects contains archaisms and innovations that distinguish them from each other. Sauk and Meskwaki appear to be the most closely related of the three, reflecting the peoples long relationship. Sauk is considered to be mutually intelligible, to a point, with Fox. In their own language, the Sauk at one time called themselves asakiwaki [a-sak-i-wa-ki], "people of the outlet". The Sauk people have a syllabic orthography for their language. They published a Primer Book in 1975, based on a "traditional" syllabary that existed in 1906. It is intended to help modern-day Sauk to learn to write and speak their ancestral tongue. A newer orthography was proposed around 1994 to aid in language revival.