The best replacement for sioux is gophers.

The best alternatives to sioux are rated as following:
★★★★★  gophers
★★★★★  lakota
★★★★  apache
★★  crow
★★  pawnee
★  hopi
★  navajo
★  cheyenne
★  comanche
★  cherokee
★  dakota
★  gophers hockey
  hopi crossword clue
  blackfoot

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Speaking about sioux, one probably shouldn't forget about lewis and clark.

Other search terms related to sioux and their ratings are:
★★★★★ lewis and clark
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sioux
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