Algonquian-speaking North American Indian people closely related to the Fox and Kickapoo who traditionally inhabited the region of what is now Green Bay, Wis., U.S. In summer the Sauk lived in bark-house villages near fields where women raised corn and other crops. In winter the village separated into patrilineal family groups that erected pole-and-thatch houses. In spring they gathered on the Iowa prairie to hunt bison. By c. 1800 the Sauk had settled along the Mississippi River in central Illinois, but they were forced to cede these lands to the U.S. In 1832 a group of Sauk and Fox led by Black Hawk made a tragically unsuccessful attempt to return to their Illinois lands. Today some 7,000 people claim Sauk and Fox ancestry.