Across the Wide Missouri (1951)

"The action, the drama, the men, the women... who blasted their heroic way into a new empire!"

In the 1830's beaver trapper Flint Mitchell and other white men hunt and trap in the then unnamed territories of Montana and Idaho. Flint marries a Blackfoot woman as a way to gain entrance into her people's rich lands, but finds she means more to him than a ticket to good beaver habitat.