What's a good movie to watch about Native Americans?

My family says that one of our ancestors came to America alone from England and married a Native American woman. She changed her name and there are no records of her before their marriage. So we don't really know our family history on her side, only on his side, but I've always been interested in learning everything I can about Native Americans. I'm not sure if this story is true and if it is, we're not sure what tribe she belonged to, so I am equally interested in all tribes. I've read a lot of books about the struggle and persecution of Native Americans. I recently saw a movie directed by a Native American man, I forget his name, with an almost all Native American cast. It was called Imprint. I was wondering if anyone could suggest any other movies in this same category or movies about Native Americans, based on fact or fiction. I've tried searching for some, but either there aren't any or I'm looking in the wrong places. Thanks for your time!