The Sacs and Fox moved into the conquered territory and also crossed the Mississippi, and into what is now Iowa. In Iowa the Sac and Fox disputed possession of eastern Iowa with the Sioux, and once again the Sacs and Fox won out, building new villages in the area they now controlled.
The Sacs built one village west of the Mississippi, which was near where the town of Montrose is now located. Their large more permanent village, Saukenuk, a virtual Indian metropolis, was located on the Rock River in Illinois.
The Mascoutins also crossed the Mississippi and inhabited an area near what is now Muscatine, and the surrounding area. They only remained in that area for a short time. They fought a furious battle with the Fox, then migrated east and merged with other tribes. The Mascoutins were not heard of after 1779.
Both the Mascoutins and Illinois Indians were not destroyed by the white man, as often thought. They were destroyed by other Indian tribes, primarily by the Sacs and Fox.
The Siouan language group was represented in Iowa and nearby states by the Iowa’s the Missouris, the Otoes, the Omahas, The Sioux or Dakotas, and Winnebagoes.
The Sioux had their hunting grounds in northern Iowa and in Minnesota. There were seven sub tribes, of which at least two hunted in Iowa; the Yanktons and the Yanktonais.
The Winnebagos may have lived in Iowa before migrating to the area around Green Bay, Wisconsin.