The term 'Sioux or Navajo' refers to two Native American tribes. The Sioux are a group of Native American tribes and First Nations peoples in North America. They are also known as the Lakota, Dakota, and Nakota. The Navajo are a Native American TRIBE from the southwestern United States. They are the largest federally recognized TRIBE in the United States, with more than 300, 000 enrolled tribal members. Both tribes have a long history of cultural and spiritual practices, and their languages are still spoken today.