Across The Wide Missouri (1951) | WESTERN | FULL MOVIE

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.

IMDb: https://www.imdb.com/title/tt0043262