“These are the languages of some of the peoples whom Lewis and Clark encountered on their journey and who were important to the expedition’s success,” Haynes said on the Montana Film Office website. “We will make every effort to find as many authentic speakers as we can to be respectful to everyone’s contribution to this important story.”

Deny Staggs, Montana Film Office commissioner, said Haynes looks for authentic actors and stays true to the native languages.

The miniseries will be based on "Undaunted Courage” by Montana author Stephen E. Ambrose, foremost chronicler of the Lewis and Clark expedition.

The miniseries is an HBO and National Geographic Entertainment project, produced by Playtone, Tom Hanks' production company, in association with Edward Norton's Class 5, and Plan B, Brad Pitt's production company.

It remains to be seen whether the movie will be filmed in Montana, but the Montana Film Office recently sponsored a two-day Montana conference for filmmakers in Butte to push for more Montana-based location shooting as a way to keep and draw jobs to the state.

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