The Sioux are a Native American tribe who have lived in Nebraska since the 18th century. They were originally from the Great Plains region but were forced to move to Nebraska in the 1800s by the United States government. The Sioux are known for their fighting spirit and were once one of the most powerful tribes on the Great Plains. They are now a federally recognized tribe with their reservation in South Dakota. However, many Sioux still live in Nebraska and are a significant part of the state's Native American population.